A fixed link or fixed crossing is a permanent, unbroken road or rail connection across water that uses some combination of bridges, tunnels, and

causeway A causeway is a track, road or railway on the upper point of an embankment across "a low, or wet place, or piece of water". It can be constructed of earth, masonry, wood, or concrete. One of the earliest known wooden causeways is the Sweet T ...

s and does not involve intermittent connections such as

drawbridge A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat. In some forms of English, including American English, the word ''drawbridge'' commonly refers to all types of moveable b ...

s or

ferries A ferry is a boat or ship that transports passengers, and occasionally vehicles and cargo, across a body of water. A small passenger ferry with multiple stops, like those in Venice, Italy, is sometimes referred to as a water taxi or water bus. ...

. A bridge–tunnel combination is commonly used for major fixed links. This is a list of proposed and actual transport links between continents and to offshore islands. See also list of bridge–tunnels for another list of fixed links including links across rivers, bays and lakes.

History

Cosmopolitan Railway

In 1890 William Gilpin first proposed to connect all the continents by land via the Cosmopolitan Railway. Significant elements of that proposal, such as the English

Channel Tunnel The Channel Tunnel (), sometimes referred to by the Portmanteau, portmanteau Chunnel, is a undersea railway tunnel, opened in 1994, that connects Folkestone (Kent, England) with Coquelles (Pas-de-Calais, France) beneath the English Channel at ...

, have been constructed since that era. However, the improvement of the global shipping industry and advent of international air travel has reduced the demand for many intercontinental land connections.

Europe

English Channel

There is no public highway connection between

Great Britain Great Britain is an island in the North Atlantic Ocean off the north-west coast of continental Europe, consisting of the countries England, Scotland, and Wales. With an area of , it is the largest of the British Isles, the List of European ...

and the

European mainland Continental Europe or mainland Europe is the contiguous mainland of Europe, excluding its surrounding islands. It can also be referred to ambiguously as the European continent, – which can conversely mean the whole of Europe – and, by so ...

; only a rail connection, the Channel Tunnel. A cross channel tunnel was first proposed in 1802 and construction actually started in 1881 before being abandoned.

Roll-on/roll-off Roll-on/roll-off (RORO or ro-ro) ships are cargo ships designed to carry wheeled cargo, such as cars, motorcycles, trucks, semi-trailer trucks, buses, Trailer (vehicle), trailers, and railroad cars, that are driven on and off the ship on their ...

ferry services provided links across the channel for vehicles. A road tunnel was proposed in 1979, but not considered viable. Construction of the Channel Tunnel started in 1988 and the tunnel opened in 1994. Automobiles and lorries/ transport trucks are loaded onto the Eurotunnel Shuttle's enclosed railway cars (similar to auto rack/ motorail railway cars) for the trip through the tunnel. A service road tunnel runs the entire length of the crossing, but is closed to general use and used only during emergencies and for maintenance. Cyclists – both amateur and professional – have crossed the channel via the tunnel on special occasions. There have been proposals at various times for a second channel tunnel of some kind.

Irish Sea

Various ferry services link Ireland to Britain and France. A number of options for an Irish Sea fixed crossing have been proposed over the years, but none are currently under serious consideration. Additionally, there was a short-lived proposal for an underground roundabout beneath the

Isle of Man The Isle of Man ( , also ), or Mann ( ), is a self-governing British Crown Dependency in the Irish Sea, between Great Britain and Ireland. As head of state, Charles III holds the title Lord of Mann and is represented by a Lieutenant Govern ...

, connecting tunnels to Ireland, Scotland, and two to England. Another proposal was for an additional route from

Scotland Scotland is a Countries of the United Kingdom, country that is part of the United Kingdom. It contains nearly one-third of the United Kingdom's land area, consisting of the northern part of the island of Great Britain and more than 790 adjac ...

to the Isle of Man. Irish Sea tunnels

Channel Islands to France

In July 2009, the

States of Jersey The States Assembly (; Jèrriais: ) is the parliament of Jersey, formed of the island's 37 deputies and the Connétable (Jersey and Guernsey), Connétable of each of the Parishes of Jersey, twelve parishes. The origins of the legislature of ...

were considering the feasibility of building a tunnel between

Jersey Jersey ( ; ), officially the Bailiwick of Jersey, is an autonomous and self-governing island territory of the British Islands. Although as a British Crown Dependency it is not a sovereign state, it has its own distinguishing civil and gov ...

(a British Crown dependency) and Lower Normandy in

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

. There was a revival of the idea in 2018 and 2021. It was reported in the local media that a link between Jersey and the neighbouring island of

Guernsey Guernsey ( ; Guernésiais: ''Guernési''; ) is the second-largest island in the Channel Islands, located west of the Cotentin Peninsula, Normandy. It is the largest island in the Bailiwick of Guernsey, which includes five other inhabited isl ...

would cost £2.6 billion.

Kerch Strait

The

Crimean Bridge The Crimean Bridge (, ; ), also called Kerch Strait Bridge or Kerch Bridge, is a pair of parallel bridges, one for a four-lane road and one for a double-track railway, spanning the Kerch Strait between the Taman Peninsula of Krasnodar Krai in ...

is a pair of parallel bridges constructed by the

Russian Federation Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

following the annexation of Crimea, to span the

Kerch Strait The Kerch Strait is a strait in Eastern Europe. It connects the Black Sea and the Sea of Azov, separating the Kerch Peninsula of Crimea in the west from the Taman Peninsula of Russia's Krasnodar Krai in the east. The strait is to wide and up ...

between the Taman Peninsula of

Krasnodar Krai Krasnodar Krai (, ) is a federal subjects of Russia, federal subject of Russia (a krai), located in the North Caucasus region in Southern Russia and is administratively a part of the Southern Federal District. Its administrative center is the t ...

and the

Kerch Peninsula The Kerch Peninsula is a major and prominent geographic peninsula located at the eastern end of the Crimean Peninsula. This peninsula stretches eastward toward the Taman Peninsula between the Sea of Azov and the Black Sea. Most of the peninsula i ...

Crimea Crimea ( ) is a peninsula in Eastern Europe, on the northern coast of the Black Sea, almost entirely surrounded by the Black Sea and the smaller Sea of Azov. The Isthmus of Perekop connects the peninsula to Kherson Oblast in mainland Ukrain ...

. The bridge complex provides for both vehicular traffic and for rail. During the Russian invasion of Ukraine, the bridge has been attacked or damaged on three occasions: 8 October 2022, 17 July 2023 and 12 August 2023. As of August 2023, the bridge reopened at a limited capacity.

Germany to Denmark to Sweden

The

Øresund Bridge The Øresund or Öresund Bridge is a combined List of road–rail bridges, railway and motorway cable-stayed bridge across the Øresund strait between Denmark and Sweden. It is the second longest bridge in Europe and combines both roadway and r ...

links southern

Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...

to the Danish island of

Zealand Zealand ( ) is the largest and most populous islands of Denmark, island in Denmark proper (thus excluding Greenland and Disko Island, which are larger in size) at 7,031 km2 (2715 sq. mi.). Zealand had a population of 2,319,705 on 1 Januar ...

. Zealand is linked to the Danish mainland and the rest of Europe by the

Great Belt Fixed Link The Great Belt Bridge () or Great Belt fixed link () is a multi-element fixed link crossing the Great Belt strait between the Danish islands of Zealand and Funen. It consists of a road suspension bridge and a railway tunnel between Zealand and ...

. Most travellers between Sweden and Germany, both by road and train, use the shorter route with a ferry over the

Fehmarn Belt Fehmarn Belt () (, former spelling ''Femer Bælt''; ) is a strait connecting the Bay of Kiel and the Bay of Mecklenburg in the western part of the Baltic Sea between the German island of Fehmarn and the Danish island of Lolland. Ferries ...

southwestwards towards

Hamburg Hamburg (, ; ), officially the Free and Hanseatic City of Hamburg,. is the List of cities in Germany by population, second-largest city in Germany after Berlin and List of cities in the European Union by population within city limits, 7th-lar ...

or southwards to

Rostock Rostock (; Polabian language, Polabian: ''Roztoc''), officially the Hanseatic and University City of Rostock (), is the largest city in the German States of Germany, state of Mecklenburg-Vorpommern and lies in the Mecklenburgian part of the sta ...

. The Fehmarn Belt Fixed Link is planned to be opened in 2029. A Gedser-Rostock Bridge is also under consideration but has been put back as the Fehmarn Belt crossing is now under construction. Proposals also exist for a fixed link from

Rügen Rügen (; Rani: ''Rȯjana'', ''Rāna''; , ) is Germany's largest island. It is located off the Pomeranian coast in the Baltic Sea and belongs to the state of Mecklenburg-Western Pomerania. The "gateway" to Rügen island is the Hanseatic ci ...

to southern Sweden, linking

Berlin Berlin ( ; ) is the Capital of Germany, capital and largest city of Germany, by both area and List of cities in Germany by population, population. With 3.7 million inhabitants, it has the List of cities in the European Union by population withi ...

and the

Øresund region Øresund or Öresund (, ; ; ), commonly known in English as the Sound, is a strait which forms the Denmark–Sweden border, Danish–Swedish border, separating Zealand (Denmark) from Scania (Sweden). The strait has a length of ; its width var ...

Sweden to Finland

Ferry services link

Finland Finland, officially the Republic of Finland, is a Nordic country in Northern Europe. It borders Sweden to the northwest, Norway to the north, and Russia to the east, with the Gulf of Bothnia to the west and the Gulf of Finland to the south, ...

via

Åland Åland ( , ; ) is an Federacy, autonomous and Demilitarized zone, demilitarised region of Finland. Receiving its autonomy by a 1920 decision of the League of Nations, it is the smallest region of Finland by both area () and population (30,54 ...

. There are proposals of fixed links between Sweden and Finland. A tunnel could be built between Sweden and Åland, about long, and deep, with the lowest depth around Märket, a little detour. The area between Åland and Finland is shallow with many islands, able to be connected with bridges - some of which already exist. Between

Umeå Umeå ( , , , locally ; ; ; ; ) is a city in northeast Sweden. It is the seat of Umeå Municipality and the capital of Västerbotten County. Situated on the Ume River, Umeå is the largest Urban areas in Sweden, locality in Norrland and the t ...

and

Vaasa Vaasa (; , ), formerly (1855-1917) known as Nikolaistad (; ),Kvarken Bridge, a series of bridges, the longest , in total . None of these proposals have been seriously investigated.

Finland to Estonia

Ferry services link

Estonia Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...

as well as overground rail and road routes via

Saint Petersburg Saint Petersburg, formerly known as Petrograd and later Leningrad, is the List of cities and towns in Russia by population, second-largest city in Russia after Moscow. It is situated on the Neva, River Neva, at the head of the Gulf of Finland ...

in Russia. Rail Baltica is a proposal for a rail link from Finland to Estonia, Latvia, Lithuania and Poland, bypassing Russia via a

Helsinki to Tallinn Tunnel Helsinki () is the Capital city, capital and most populous List of cities and towns in Finland, city in Finland. It is on the shore of the Gulf of Finland and is the seat of southern Finland's Uusimaa region. About people live in the municipali ...

. The

gulf A gulf is a large inlet from an ocean or their seas into a landmass, larger and typically (though not always) with a narrower opening than a bay (geography), bay. The term was used traditionally for large, highly indented navigable bodies of s ...

has heavy ferry traffic, and the port of Helsinki has the largest number of international passengers of any port in Europe, and most travel to

Tallinn Tallinn is the capital city, capital and List of cities in Estonia, most populous city of Estonia. Situated on a Tallinn Bay, bay in north Estonia, on the shore of the Gulf of Finland of the Baltic Sea, it has a population of (as of 2025) and ...

or back. Finland and Estonia share close linguistic, cultural, economic and historical ties and proponents of what they call " Talsinki" (a portmanteau of the names of the two capitals) point to the

as an example of a cross-national metropolitan area linked by an underwater bridge-tunnel. A combination of a Finland to Estonia and a Finland to Sweden fixed link would reduce the need for ferries on the route the MS ''Estonia'' was on when it sank in 1994 causing a loss of 852 lives, the biggest peacetime maritime disaster in the Baltic.

Italian mainland to Sicily

The

Strait of Messina The Strait of Messina (; ) is a narrow strait between the eastern tip of Sicily (Punta del Faro) and the western tip of Calabria (Punta Pezzo) in Southern Italy. It connects the Tyrrhenian Sea to the north with the Ionian Sea to the south, with ...

has a busy ferry traffic. The Strait of Messina Bridge is planned, but the construction date has been postponed several times.

Italian mainland to Elba

There is a project to link

Elba Elba (, ; ) is a Mediterranean Sea, Mediterranean island in Tuscany, Italy, from the coastal town of Piombino on the Italian mainland, and the largest island of the Tuscan Archipelago. It is also part of the Arcipelago Toscano National Park, a ...

with mainland Italy (through

Piombino Piombino is an Italian town and ''comune'' of about 35,000 inhabitants in the province of Livorno (Tuscany). It lies on the border between the Ligurian Sea and the Tyrrhenian Sea, in front of Elba Island and at the northern side of Maremma. Ov ...

Tuscany Tuscany ( ; ) is a Regions of Italy, region in central Italy with an area of about and a population of 3,660,834 inhabitants as of 2025. The capital city is Florence. Tuscany is known for its landscapes, history, artistic legacy, and its in ...

) crossing the Piombino Channel in a Road Tunnel of 16 km. The feasibility project was launched by the Cacelli Partners Ltd of Riccardo Cacelli, in collaboration with the Adu London studio of the architect David Ulivagnoli.

Sardegna–Maddalena

There is a project of an underwater tunnel that will link

Palau Palau, officially the Republic of Palau, is an island country in the Micronesia subregion of Oceania in the western Pacific Ocean. The Republic of Palau consists of approximately 340 islands and is the western part of the Caroline Islands ...

(in

Sardinia Sardinia ( ; ; ) is the Mediterranean islands#By area, second-largest island in the Mediterranean Sea, after Sicily, and one of the Regions of Italy, twenty regions of Italy. It is located west of the Italian Peninsula, north of Tunisia an ...

) with the island of La Maddalena, crossing a 3 km stretch of sea.

Corsica–Sardegna

The has been interest from Hyperloop One in using

Hyperloop Hyperloop is a proposed high-speed transportation system for both passengers and freight. The concept was published by entrepreneur Elon Musk in a 2013 white paper, where the hyperloop was described as a transportation system using capsules supp ...

to connect the islands.

Italy–Croatia Bridge

There were proposals to build a railway and highway bridge over the

Adriatic sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...

to connect

Italy Italy, officially the Italian Republic, is a country in Southern Europe, Southern and Western Europe, Western Europe. It consists of Italian Peninsula, a peninsula that extends into the Mediterranean Sea, with the Alps on its northern land b ...

and

Croatia Croatia, officially the Republic of Croatia, is a country in Central Europe, Central and Southeast Europe, on the coast of the Adriatic Sea. It borders Slovenia to the northwest, Hungary to the northeast, Serbia to the east, Bosnia and Herze ...

, from

Ancona Ancona (, also ; ) is a city and a seaport in the Marche region of central Italy, with a population of around 101,997 . Ancona is the capital of the province of Ancona, homonymous province and of the region. The city is located northeast of Ro ...

Zadar Zadar ( , ), historically known as Zara (from Venetian and Italian, ; see also other names), is the oldest continuously inhabited city in Croatia. It is situated on the Adriatic Sea, at the northwestern part of Ravni Kotari region. Zadar ...

following a 120 km route. The idea was presented by the Roman architect Giorgio De Romanis, and also called for the creation of a special company "Il ponte sull'Adriatico Srl". The bridge would be suspended above the sea at a height of between 30 and 70 meters, and would also allow the laying of pipes for water, oil and gas, as well as the accommodation of telecommunication cables. The idea received the support of the ex-governor of the

Marche Marche ( ; ), in English sometimes referred to as the Marches ( ) from the Italian name of the region (Le Marche), is one of the Regions of Italy, twenty regions of Italy. The region is located in the Central Italy, central area of the country, ...

, Gian Mario Spacca. Some sources considered the project as being more realistic than a bridge between Calabria and Sicily

Italy–Albania Tunnel

The Vlora-Otranto Tunnel is a proposed undersea tunnel that aims to connect

Vlorë Vlorë ( ; ; sq-definite, Vlora) is the List of cities and towns in Albania, third most populous city of Albania and seat of Vlorë County and Vlorë Municipality. Located in southwestern Albania, Vlorë sprawls on the Bay of Vlorë and is surr ...

, in

Albania Albania ( ; or ), officially the Republic of Albania (), is a country in Southeast Europe. It is located in the Balkans, on the Adriatic Sea, Adriatic and Ionian Seas within the Mediterranean Sea, and shares land borders with Montenegro to ...

, with

Otranto Otranto (, , ; ; ; ; ) is a coastal town, port and ''comune'' in the province of Lecce (Apulia, Italy), in a fertile region once famous for its breed of horses. It is one of I Borghi più belli d'Italia ("The most beautiful villages of Italy"). ...

, in

, across the Strait of Otranto, a narrow strip of water that separates the

Adriatic Sea The Adriatic Sea () is a body of water separating the Italian Peninsula from the Balkans, Balkan Peninsula. The Adriatic is the northernmost arm of the Mediterranean Sea, extending from the Strait of Otranto (where it connects to the Ionian Se ...

from the

Ionian Sea The Ionian Sea (, ; or , ; , ) is an elongated bay of the Mediterranean Sea. It is connected to the Adriatic Sea to the north, and is bounded by Southern Italy, including Basilicata, Calabria, Sicily, and the Salento peninsula to the west, ...

and is about 71 kilometers (44 miles) wide at its narrowest point.

Norway

The Boknafjord tunnel (main part of the Rogfast project) is under construction and will in 2033 be the world's longest and deepest undersea road tunnel, long and reach under sea level. It will connect the island of Bokn with the mainland at

Stavanger Stavanger, officially the Stavanger Municipality, is a city and municipalities of Norway, municipality in Norway. It is the third largest city and third largest metropolitan area in Norway (through conurbation with neighboring Sandnes) and the ...

under the open Bokna Fjord.

Faroe Islands

Tunnels and bridges are an important part of the

Faroe Islands The Faroe Islands ( ) (alt. the Faroes) are an archipelago in the North Atlantic Ocean and an autonomous territory of the Danish Realm, Kingdom of Denmark. Located between Iceland, Norway, and the United Kingdom, the islands have a populat ...

transportation network. The longest proposed one is the 25 km

Suðuroyartunnilin Suðuroyartunnilin (the Suðuroy Tunnel) is a planned undersea tunnel in the Faroe Islands, linking the island of Suðuroy to Sandoy. As of 2024, all vehicles and cargo, and virtually all passenger traffic must use the ferry service. Current sit ...

(the Suðuroy Tunnel).

Iceland

Vestmannaeyjagöng is a proposed undersea tunnel linking the archipelago

Vestmannaeyjar Vestmannaeyjar (, sometimes anglicized as Westman Islands) is a municipality and archipelago off the south coast of Iceland. The largest island, Heimaey, has a population of 4,414, most of whom live in the archipelago's main town, Vestmannaeyja ...

to the Icelandic mainland.

Europe to Africa

Gibraltar Tunnel

The Gibraltar Tunnel is proposed to be a rail tunnel linking Africa and Europe. A tunnel would likely be an electrified rail tunnel with car shuttles due to the depth of the

Strait of Gibraltar The Strait of Gibraltar is a narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates Europe from Africa. The two continents are separated by 7.7 nautical miles (14.2 kilometers, 8.9 miles) at its narrowest point. Fe ...

(up to ) and the length of the tunnel making it a great challenge to remove vehicle exhaust. Similar considerations led to the Channel Tunnel linking the UK and France not being a highway tunnel. There have also been proposals for a bridge over the strait, although ship traffic would complicate this solution. Car ferries currently operate across the strait.

Strait of Sicily

The proposed Strait of Sicily Tunnel would link

Sicily Sicily (Italian language, Italian and ), officially the Sicilian Region (), is an island in the central Mediterranean Sea, south of the Italian Peninsula in continental Europe and is one of the 20 regions of Italy, regions of Italy. With 4. ...

Tunisia Tunisia, officially the Republic of Tunisia, is a country in the Maghreb region of North Africa. It is bordered by Algeria to the west and southwest, Libya to the southeast, and the Mediterranean Sea to the north and east. Tunisia also shares m ...

. Together with the proposed Strait of Messina Bridge from Sicily to

this would provide a fixed link between Italy and Tunisia.

Europe to Asia

The

Turkish Straits The Turkish Straits () are two internationally significant waterways in northwestern Turkey. The Straits create a series of international passages that connect the Aegean and Mediterranean seas to the Black Sea. They consist of the Dardanelles ...

are the channel between European

Turkey Turkey, officially the Republic of Türkiye, is a country mainly located in Anatolia in West Asia, with a relatively small part called East Thrace in Southeast Europe. It borders the Black Sea to the north; Georgia (country), Georgia, Armen ...

and Asian Turkey and consist of the (from south to north) the

Dardanelles The Dardanelles ( ; ; ), also known as the Strait of Gallipoli (after the Gallipoli peninsula) and in classical antiquity as the Hellespont ( ; ), is a narrow, natural strait and internationally significant waterway in northwestern Turkey th ...

, the

Sea of Marmara The Sea of Marmara, also known as the Sea of Marmora or the Marmara Sea, is a small inland sea entirely within the borders of Turkey. It links the Black Sea and the Aegean Sea via the Bosporus and Dardanelles straits, separating Turkey's E ...

and the

Bosphorus The Bosporus or Bosphorus Strait ( ; , colloquially ) is a natural strait and an internationally significant waterway located in Istanbul, Turkey. The Bosporus connects the Black Sea to the Sea of Marmara and forms one of the continental bo ...

The Bosphorus

Three

suspension bridge A suspension bridge is a type of bridge in which the deck (bridge), deck is hung below suspension wire rope, cables on vertical suspenders. The first modern examples of this type of bridge were built in the early 1800s. Simple suspension bridg ...

s cross the Bosphorus. The first of these, the Bosphorus Bridge, is long and was completed in 1973. The second, named Fatih Sultan Mehmet (Bosporus II) Bridge, is long, and was completed in 1988 about north of the first bridge. The Bosphorus Bridge forms part of the O1 Motorway, while the Fatih Sultan Mehmet Bridge forms part of the Trans-European Motorway. Construction of a third suspension bridge, the

Yavuz Sultan Selim Bridge The Yavuz Sultan Selim Bridge (), also known as the Third Bosphorus Bridge'','' is a vehicular bridge over the Bosphorus strait, to the north of Istanbul's two older suspension bridges, the 15 July Martyrs Bridge being the First Bosphorus Bridge ...

, began on May 29, 2013; it was opened to traffic on August 26, 2016. The bridge was built near the northern end of the Bosporus, between the villages of Garipçe on the European side and Poyrazköy on the Asian side. It is part of the "Northern Marmara Motorway", which will be further integrated with the existing Black Sea Coastal Highway, and will allow transit traffic to bypass city traffic. The Marmaray project, featuring a long undersea

railway Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in railway track, tracks, which usually consist of two parallel steel railway track, rails. Rail transport is one of the two primary means of ...

tunnel A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ve ...

, opened on 29 October 2013. Approximately of the tunnel runs under the strait, at a depth of about . An undersea water supply tunnel with a length of , named the Bosporus Water Tunnel, was constructed in 2012 to transfer water from the Melen Creek in

Düzce Province Düzce Province () is a Provinces of Turkey, province in northwestern Turkey. The province is on the coastline of the Black Sea and is traversed by the main highway between Istanbul and Ankara. The primary town is Düzce, located in the center of t ...

(to the east of the Bosporus strait, in northwestern

Anatolia Anatolia (), also known as Asia Minor, is a peninsula in West Asia that makes up the majority of the land area of Turkey. It is the westernmost protrusion of Asia and is geographically bounded by the Mediterranean Sea to the south, the Aegean ...

) to the European side of Istanbul, a distance of .CNN Türk: "Melen hattı Boğaz'ı geçti" (21-05-2012)
/ref> The Eurasia Tunnel is a road tunnel between Kazlicesme and Goztepe, which began construction in February 2011 and opened to traffic on 21 December 2016. The Great Istanbul Tunnel, a proposed undersea road and railway tunnel, will connect Şişli and Beykoz districts.

The Dardanelles

The Çanakkale 1915 Bridge opened in 2022, crossing the strait between the cities of

Gelibolu Gelibolu is a town in Çanakkale Province of the Marmara Region, located in Eastern Thrace in the European part of Turkey. It is located on the southern shore of the Gallipoli, peninsula named after it on the Dardanelles strait, away from Lapsek ...

and

Lapseki Lapseki (from Greek language, Greek: :el:Λάμψακος, Λάμψακος, ''Lampsakos'') is a town in Çanakkale Province, Turkey. It is the seat of Lapseki District.Mubarak Peace Bridge, also known as the Egyptian-Japanese Friendship Bridge, Al Salam Bridge, or Al Salam Peace Bridge, is a road bridge crossing the

Suez Canal The Suez Canal (; , ') is an artificial sea-level waterway in Egypt, Indo-Mediterranean, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia (and by extension, the Sinai Peninsula from the rest ...

at El-Qantara, whose name means "the bridge" in

Egyptian Arabic Egyptian Arabic, locally known as Colloquial Egyptian, or simply as Masri, is the most widely spoken vernacular Arabic variety in Egypt. It is part of the Afro-Asiatic language family, and originated in the Nile Delta in Lower Egypt. The esti ...

. The bridge links the continents of Africa and Asia.

Saudi–Egypt Causeway

The Saudi–Egypt Causeway is a proposal for a causeway and bridge between the

Sinai Peninsula The Sinai Peninsula, or simply Sinai ( ; ; ; ), is a peninsula in Egypt, and the only part of the country located in Asia. It is between the Mediterranean Sea to the north and the Red Sea to the south, and is a land bridge between Asia and Afri ...

in Egypt and the northern part of

Saudi Arabia Saudi Arabia, officially the Kingdom of Saudi Arabia (KSA), is a country in West Asia. Located in the centre of the Middle East, it covers the bulk of the Arabian Peninsula and has a land area of about , making it the List of Asian countries ...

. This would provide a direct road route between Egypt and Saudi Arabia without going through Israel or Jordan. A causeway faces considerable political hurdles as the disruption of Israeli shipping access to the Red Sea was seen as a

casus belli A (; ) is an act or an event that either provokes or is used to justify a war. A ''casus belli'' involves direct offenses or threats against the nation declaring the war, whereas a ' involves offenses or threats against its ally—usually one bou ...

by Israel ahead of the

Six-Day War The Six-Day War, also known as the June War, 1967 Arab–Israeli War or Third Arab–Israeli War, was fought between Israel and a coalition of Arab world, Arab states, primarily United Arab Republic, Egypt, Syria, and Jordan from 5 to 10June ...

. There is a car ferry between Safaga, Egypt and Duba, Saudi Arabia. The two uninhabited islands in the strait ( Tiran island and

Sanafir island Sanafir Island (, ) is a Saudi Island. It was previously administered by Egypt. Its area is about and it is located at the entrance to the Straits of Tiran, which separates the Gulf of Aqaba from the Red Sea. The island is about 2.5 km f ...

), which might be used for a bridge, tunnel or causeway, were disputed between Egypt and Saudi Arabia until President Abdel Fatah al-Sisi of Egypt officially ceded them to Saudi Arabia in 2016/2017. The potential construction of a fixed link was cited in some media reports as contributing to the cession.

Bridge of the Horns

The Bridge of the Horns is a proposed construction project to build a bridge between the coasts of

Djibouti Djibouti, officially the Republic of Djibouti, is a country in the Horn of Africa, bordered by Somalia to the south, Ethiopia to the southwest, Eritrea in the north, and the Red Sea and the Gulf of Aden to the east. The country has an area ...

and

Yemen Yemen, officially the Republic of Yemen, is a country in West Asia. Located in South Arabia, southern Arabia, it borders Saudi Arabia to Saudi Arabia–Yemen border, the north, Oman to Oman–Yemen border, the northeast, the south-eastern part ...

across the

Bab-el-Mandeb The Bab-el-Mandeb (), the Gate of Grief or the Gate of Tears, is a strait between Yemen on the Arabian Peninsula and Djibouti and Eritrea in the Horn of Africa. It connects the Red Sea to the Gulf of Aden and by extension the Indian Ocean. ...

, the strait between the

Red Sea The Red Sea is a sea inlet of the Indian Ocean, lying between Africa and Asia. Its connection to the ocean is in the south, through the Bab-el-Mandeb Strait and the Gulf of Aden. To its north lie the Sinai Peninsula, the Gulf of Aqaba, and th ...

and

Gulf of Aden The Gulf of Aden (; ) is a deepwater gulf of the Indian Ocean between Yemen to the north, the Arabian Sea to the east, Djibouti to the west, and the Guardafui Channel, the Socotra Archipelago, Puntland in Somalia and Somaliland to the south. ...

. There are no ferry services on this route as of 2018.

Jazan–Massawa Tunnel

Saudi Arabia considers to develop a 440 km tunnel across the

to link its industrial city of Jazan with

Massawa Massawa or Mitsiwa ( ) is a port city in the Northern Red Sea Region, Northern Red Sea region of Eritrea, located on the Red Sea at the northern end of the Gulf of Zula beside the Dahlak Archipelago. It has been a historically important port for ...

's port in

Eritrea Eritrea, officially the State of Eritrea, is a country in the Horn of Africa region of East Africa, with its capital and largest city being Asmara. It is bordered by Ethiopia in the Eritrea–Ethiopia border, south, Sudan in the west, and Dj ...

. It had the support of

Pakistan Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the List of countries and dependencies by population, fifth-most populous country, with a population of over 241.5 million, having the Islam by country# ...

and the Chinese Belt and Road Initiative.

Asia

Sri Lanka

The Palk Strait bridge proposal between

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

. India Boat Mail train and ferry service provided a train and ferry service from

until the

First World War World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. An India–Sri Lanka HVDC Interconnection is under consideration to link the electricity networks of these countries.

South East Asian islands

Mainland

Peninsular Malaysia Peninsular Malaysia, historically known as Malaya and also known as West Malaysia or the Malaysian Peninsula, is the western part of Malaysia that comprises the southern part of the Malay Peninsula on Mainland Southeast Asia and the list of isla ...

is linked to

Penang Island Penang Island is the main constituent island of the Malaysian state of Penang. It is located off the western coast of Peninsular Malaysia by the Malacca Strait, with the Penang Strait separating the island from Seberang Perai on the mainla ...

by two road bridges: the Penang Bridge and the

Sultan Abdul Halim Muadzam Shah Bridge The Sultan Abdul Halim Muadzam Shah Bridge (), also known as the Penang Second Bridge (), is a dual carriageway toll bridge in Penang, Malaysia. It connects Bandar Cassia (Batu Kawan) in Seberang Perai, Peninsular Malaysia, with Batu Maung on ...

(Penang Second Bridge). To the south, it is linked to Singapore Island across the

Straits of Johor The Johor Strait (also known as the Tebrau Strait, Straits of Johor, Selat Johor, Selat Tebrau, and Tebrau Reach, also spelled Johore Strait) is an international strait in Southeast Asia, between Singapore and Peninsular Malaysia. Geography ...

by the Johor–Singapore Causeway and the Malaysia–Singapore Second Link; the former also carries Malaysia's West Coast Line to the island. There are proposals to link

Johor Johor, also spelled Johore,'' is a States and federal territories of Malaysia, state of Malaysia in the south of the Malay Peninsula. It borders with Pahang, Malacca and Negeri Sembilan to the north. Johor has maritime borders with Singapore ...

(in

Malaysia Malaysia is a country in Southeast Asia. Featuring the Tanjung Piai, southernmost point of continental Eurasia, it is a federation, federal constitutional monarchy consisting of States and federal territories of Malaysia, 13 states and thre ...

) and

Riau Riau (Jawi script, Jawi: ) is a Provinces of Indonesia, province of Indonesia. It is located on the central eastern coast of the island of Sumatra, and extends from the eastern slopes of the Barisan Mountains to the Malacca Strait, including s ...

(in

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...

), in a Malacca Strait Bridge or underwater tunnel crossing

Strait of Malacca The Strait of Malacca is a narrow stretch of water, long and from wide, between the Malay Peninsula to the northeast and the Indonesian island of Sumatra to the southwest, connecting the Andaman Sea (Indian Ocean) and the South China Sea (Pa ...

and some islands. The longest connection is a 17.5 kilometer. The total length is between 39 and 40 kilometers. There's also a proposal of a Singapore Strait crossing linking

Singapore Singapore, officially the Republic of Singapore, is an island country and city-state in Southeast Asia. The country's territory comprises one main island, 63 satellite islands and islets, and one outlying islet. It is about one degree ...

with the

Riau archipelago The Riau Archipelago is a ''geographic'' term (as opposed to administrative region) for the core group of islands within the Riau Islands Province in Indonesia, and located south of Singapore and east of Riau on Sumatra. Before the province of Ri ...

, most likely with the island of

Batam Batam, officially the City of Batam (, not to be confused with ''Batam Kota'', a kecamatan, district within this city), is the largest List of regencies and cities of Indonesia, city in the Indonesian province of Riau Islands. The city administra ...

. Both projects would link Indonesia (specifically Sumatra and Java islands) to Mainland Asia. Passenger and vehicle ferries link the various islands of

, the

Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...

, and

Papua New Guinea Papua New Guinea, officially the Independent State of Papua New Guinea, is an island country in Oceania that comprises the eastern half of the island of New Guinea and offshore islands in Melanesia, a region of the southwestern Pacific Ocean n ...

. There are proposals to link

Java Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...

, the most populated Island of

, to

Sumatra Sumatra () is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the list of islands by area, sixth-largest island in the world at 482,286.55 km2 (182,812 mi. ...

via a proposed Sunda Strait Bridge and from Sumatra to

and/or

via the Malacca Strait Bridge.

Hainan Island

The Guangdong–Hainan Ferry, or the Yuehai Ferry (part of the Guangdong–Hainan Railway) is a vehicle and

train ferry A train ferry is a ship (ferry) designed to carry Railroad car, railway vehicles, as well as their cargoes and passengers. Typically, one level of the ship is fitted with Track (rail transport), railway tracks, and the vessel has a door at the f ...

connecting

Hainan Hainan is an island provinces of China, province and the southernmost province of China. It consists of the eponymous Hainan Island and various smaller islands in the South China Sea under the province's administration. The name literally mean ...

Island to

Guangdong ) means "wide" or "vast", and has been associated with the region since the creation of Guang Prefecture in AD 226. The name "''Guang''" ultimately came from Guangxin ( zh, labels=no, first=t, t= , s=广信), an outpost established in Han dynasty ...

mainland China "Mainland China", also referred to as "the Chinese mainland", is a Geopolitics, geopolitical term defined as the territory under direct administration of the People's Republic of China (PRC) in the aftermath of the Chinese Civil War. In addit ...

. The ferries run across the

Qiongzhou Strait The Qiongzhou Strait, also called the is the Chinese strait that separates Guangdong's Leizhou Peninsula from the island province of Hainan. It connects the Gulf of Tonkin on its west to the South China Sea on its east. The strait is on averag ...

, between

Zhanjiang Zhanjiang; Leizhou Min: ''Tchiàm-kōng''; previously Tsamkong or Guangzhouwan, then romanized in English as Kwangchowan or Kwangchow Wan. is a port city on the southwestern panhandle of Guangdong province in South China. The prefecture- ...

and

Haikou Haikou; Chinese postal romanization, formerly romanized as Hoihow is the capital city, capital and most populous city of the Chinese province of Hainan. Haikou city is situated on the northern coast of Hainan, by the mouth of the Nandu River. ...

. A road-rail bridge has been proposed.

Bohai Strait

Bohai Strait tunnel project The Bohai Strait Tunnel or Dalian-Yantai Tunnel is a proposed undersea tunnel construction project across the Bohai Strait to connect Dalian on the Liaodong Peninsula with Yantai on the Shandong Peninsula. The official name for the project is Bo ...

is a proposed connection that would connect the Chinese cities of

Yantai Yantai, formerly known as Chefoo, is a coastal prefecture-level city on the Shandong Peninsula in northeastern Shandong province of the People's Republic of China. Lying on the southern coast of the Bohai Strait, Yantai borders Qingdao ...

and

Dalian Dalian ( ) is a major sub-provincial port city in Liaoning province, People's Republic of China, and is Liaoning's second largest city (after the provincial capital Shenyang) and the third-most populous city of Northeast China (after Shenyang ...

across the

Bohai Strait The Bohai Sea ( zh, c=渤海, p=Bó Hǎi, l=Bo Sea) is a gulf/ inland sea approximately in area on the east coast of Mainland China. It is the northwestern and innermost extension of the Yellow Sea, to which it connects via the Bohai Strait. ...

Taiwan

The Taiwan Strait Tunnel Project is a proposed

undersea tunnel An underwater tunnel is a tunnel which is partly or wholly constructed under the sea or a river. They are often used where building a bridge or operating a ferry link is unviable, or to provide competition or relief for existing bridges or ferry l ...

to connect Pingtan in the

People's Republic of China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

Hsinchu Hsinchu (, ), officially Hsinchu City, is a city located in northwestern Taiwan. It is the most populous city in Taiwan that is not a special municipality, with estimated 450,655 inhabitants. Hsinchu is a coastal city bordering the Taiwan ...

in northern

Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...

as part of the G3 Beijing–Taipei Expressway. First proposed in 1996, the project has since been subject to a number of academic discussions and feasibility studies, including by the China Railway Engineering Corporation. There exist cross strait ferries, both within outlying islands of Taiwan and between the PRC and Taiwan. The

political status of Taiwan The island of Taiwan is the subject of a geopolitical dispute between the Republic of China (ROC), which controls it, and the People's Republic of China (PRC), which claims it as part of its territory. The Republic of China (ROC) was establ ...

complicates any such proposal.

Korea to China

The Korean government considered building underwater tunnels with China, the proposed route would be between

Incheon Incheon is a city located in northwestern South Korea, bordering Seoul and Gyeonggi Province to the east. Inhabited since the Neolithic, Incheon was home to just 4,700 people when it became an international port in 1883. As of February 2020, ...

Weihai Weihai ( zh, t=, p=Wēihǎi), formerly Weihaiwei ( zh, s=, p=Wēihǎiwèi, l=Mighty Sea Fort, first=t), is a prefecture-level city and major seaport city in the easternmost Shandong province of China. It borders Yantai to the west and the Yellow ...

, being considerate to build an intermediary

artificial island An artificial island or man-made island is an island that has been Construction, constructed by humans rather than formed through natural processes. Other definitions may suggest that artificial islands are lands with the characteristics of hum ...

in the route of 341 kilometers. Other Korean cities, like Ongjin, Hwaseong and

Pyeongtaek Pyeongtaek (; ) is a city in Gyeonggi Province, South Korea. Located in the southwestern part of the province, Pyeongtaek was founded as a union of two districts in 1940. It was elevated to city status in 1986 and is home to a South Korean naval b ...

, are considered to be part of the routes to China. Also, is part of the Chinese comprehensive development plan for the Bohai area.

Mokpo–Jeju

The Jeju Undersea Tunnel is a project to connect the South Korean provinces of South Jeolla and Jeju across the Jeju Strait, with intermediate stops at the islands of Bogildo and Chujado. The total length of the proposed railway is 167 km, including a 66 km surface interval from Mokpo to Haenam, a 28 km bridge section from Haenam to Bogil Island, and a 73 km stretch from Bogil to Chuja and Jeju Islands.

Busan–Geoje Bridge

The Busan–Geoje Fixed Link (or Geoga Bridge) is an 8.2-km bridge-tunnel fixed link that connects the

South Korea South Korea, officially the Republic of Korea (ROK), is a country in East Asia. It constitutes the southern half of the Korea, Korean Peninsula and borders North Korea along the Korean Demilitarized Zone, with the Yellow Sea to the west and t ...

n city of

Busan Busan (), officially Busan Metropolitan City, is South Korea's second list of cities in South Korea by population, most populous city after Seoul, with a population of over 3.3 million as of 2024. Formerly romanized as Pusan, it is the economi ...

Geoje Island Geojedo (), or Geoje Island, is the principal island of Geoje, South Gyeongsang Province, South Korea. It is joined to land by two bridges from nearby Tongyeong. Gohyeon is the largest town on the island. Geojedo covers an area of , the second l ...

Korea to Japan

The " Korea Japan Friendship Tunnel System" is a proposal for a fixed link from the city of

Fukuoka is the List of Japanese cities by population, sixth-largest city in Japan and the capital city of Fukuoka Prefecture, Japan. The city is built along the shores of Hakata Bay, and has been a center of international commerce since ancient times. ...

Kyūshū is the third-largest island of Japan's four main islands and the most southerly of the four largest islands (i.e. excluding Okinawa and the other Ryukyu (''Nansei'') Islands). In the past, it has been known as , and . The historical regio ...

, Japan, to the port city of

in Korea via four islands. The maximum ocean depth in this area is . Similar proposals have been discussed for decades by Korean and Japanese politicians. A road bridge links Kyūshū to the main Japanese island of

Honshu , historically known as , is the largest of the four main islands of Japan. It lies between the Pacific Ocean (east) and the Sea of Japan (west). It is the list of islands by area, seventh-largest island in the world, and the list of islands by ...

Japan to Russia

The Seikan Tunnel has provided a rail link from the main Japanese Island of

to the northernmost Japanese island of

Hokkaido is the list of islands of Japan by area, second-largest island of Japan and comprises the largest and northernmost prefectures of Japan, prefecture, making up its own list of regions of Japan, region. The Tsugaru Strait separates Hokkaidō fr ...

since 1988. The proposed Sakhalin-Hokkaido Tunnel would link Hokkaido to the Russian island of

Sakhalin Sakhalin ( rus, Сахали́н, p=səxɐˈlʲin) is an island in Northeast Asia. Its north coast lies off the southeastern coast of Khabarovsk Krai in Russia, while its southern tip lies north of the Japanese island of Hokkaido. An islan ...

. When combined with the proposed Sakhalin Tunnel between Sakhalin and the Russian Mainland and an extension of the

Baikal Amur Mainline Lake Baikal is a rift lake and the deepest lake in the world. It is situated in southern Siberia, Russia between the Federal subjects of Russia, federal subjects of Irkutsk Oblast, Irkutsk Oblasts of Russia, Oblast to the northwest and the Repu ...

this would give a rail link from Japan to

Russia Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the list of countries and dependencies by area, largest country in the world, and extends across Time in Russia, eleven time zones, sharing Borders ...

and the mainland of Asia.

Hong Kong–Zhuhai–Macau Bridge

The

Hong Kong–Zhuhai–Macau Bridge The Hong Kong–Zhuhai–Macau Bridge (HZMB) is a bridge–tunnel system consisting of a series of three cable-stayed bridges, an undersea tunnel, and four artificial islands. It is both the longest sea crossing and the longest Intercontinent ...

links

Hong Kong Hong Kong)., Legally Hong Kong, China in international treaties and organizations. is a special administrative region of China. With 7.5 million residents in a territory, Hong Kong is the fourth most densely populated region in the wor ...

and

Macau Macau or Macao is a special administrative regions of China, special administrative region of the People's Republic of China (PRC). With a population of about people and a land area of , it is the most List of countries and dependencies by p ...

, and

Zhuhai Zhuhai; Yale romanization of Cantonese, Yale: ''Jyūhói''; Chinese postal romanization, also known as Chuhai is a prefecture-level city located on the west bank of the Pearl River (China), Pearl River estuary on the central coast of southern ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

. Opened on October 24, 2018, it is the longest fixed crossing in the world.

Hōyo Strait

Shikoku is the smallest of the List of islands of Japan#Main islands, four main islands of Japan. It is long and between at its widest. It has a population of 3.8 million, the least populated of Japan's four main islands. It is south of Honshu ...

and

Kyushu is the third-largest island of Japan's Japanese archipelago, four main islands and the most southerly of the four largest islands (i.e. excluding Okinawa Island, Okinawa and the other Ryukyu Islands, Ryukyu (''Nansei'') Ryukyu Islands, Islands ...

are the only adjacent major Japanese islands not directly connected by a fixed link. Road travel between the two is possible only via

, a detour of up to 600 km. Since 1995, the Ōita and Ehime prefectures have been jointly conducting research into the technical feasibility of bridges over the Hōyo Strait and conducting basic research into natural and social conditions, and in 1998, in the "Hoyo Kaikyo Bridge Survey Report" it was concluded that the bridge would be technically feasible. The bridge proposed in the report uses a four-span suspension bridge with a central tower height of 376 m, central span length of 3,000 m, and bridge length of about 8,400 m as the main bridge, connecting the Toyo Strait with two bridges, the extension would be about 12.7 km. The total project cost is currently estimated to be about 1.3 trillion yen (US$12.1 billion). The Hoyo Kaikyo Route Promotion Council conducted a survey comparing various crossing technologies (bridges, tunnels) and modes of transportation (automobiles, railways) in 1997, and "Transportation method comparison study report" was published. According to the report, in the case of bridges, road bridges are technically possible, but due to the long span, it is difficult to use them as railway bridges and combined bridges.豊予海峡ルート輸送方式比較検討調査
豊予海峡ルート推進協議会事務局

Qatar–Bahrain Causeway

The Qatar Bahrain Causeway was a planned

between the two

Arab states The Arab world ( '), formally the Arab homeland ( '), also known as the Arab nation ( '), the Arabsphere, or the Arab states, comprises a large group of countries, mainly located in West Asia and North Africa. While the majority of people in ...

Qatar Qatar, officially the State of Qatar, is a country in West Asia. It occupies the Geography of Qatar, Qatar Peninsula on the northeastern coast of the Arabian Peninsula in the Middle East; it shares Qatar–Saudi Arabia border, its sole land b ...

and

Bahrain Bahrain, officially the Kingdom of Bahrain, is an island country in West Asia. Situated on the Persian Gulf, it comprises a small archipelago of 50 natural islands and an additional 33 artificial islands, centered on Bahrain Island, which mak ...

. It was expected that a ferry service would be established between the two countries in 2017. Due to the

Qatar diplomatic crisis The Qatar diplomatic crisis was a high-profile deterioration of relations between Qatar and the Arab League between 2017 and 2021. It began when Saudi Arabia, the United Arab Emirates, Bahrain, and Egypt simultaneously severed their bilateral relat ...

and Bahrain's siding with Saudi Arabia, the bridge is very unlikely ever to be built.

King Fahd Causeway

The King Fahd Causeway is a series of

bridge A bridge is a structure built to Span (engineering), span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over the obstacle, whi ...

s and

s connecting

and

. At , the western terminus of the causeway is the ''al-Khour'' neighbourhood of Khobar, Saudi Arabia and the eastern terminus is Al Jasra, Bahrain.

Iran–Qatar–Saudi Arabia Tunnel

Iran Iran, officially the Islamic Republic of Iran (IRI) and also known as Persia, is a country in West Asia. It borders Iraq to the west, Turkey, Azerbaijan, and Armenia to the northwest, the Caspian Sea to the north, Turkmenistan to the nort ...

and Qatar (who will take most part of the project's financing) have plans for an underwater tunnel connecting the two countries, being planned to be the longest tunnel in the world (having 190 km). It would link the Iranian port of Bandar-e Deyr to an unspecified location in Qatar across the

Persian Gulf The Persian Gulf, sometimes called the Arabian Gulf, is a Mediterranean seas, mediterranean sea in West Asia. The body of water is an extension of the Arabian Sea and the larger Indian Ocean located between Iran and the Arabian Peninsula.Un ...

in both road and railway sections; however, a road tunnel is not considered very feasible due to the long distance. It had the support of Iran's Ports and Maritime Organisation managing director, Ali Akbar Safaei, and Iranian President

Ebrahim Raisi Ebrahim Raisolsadati (14 December 1960 – 19 May 2024), better known as Ebrahim Raisi, was an Iranian politician who served as the eighth president of Iran from 2021 until 2024 Varzaqan helicopter crash, his death in a helicopter crash in 202 ...

, who expect the creation of a joint Qatar-Iran committee with the Emir of Qatar,

Tamim bin Hamad Al Thani Tamim bin Hamad bin Khalifa Al Thani (; born 3 June 1980) is Emir of Qatar, reigning since 2013. Tamim is the fourth son of former emir Hamad bin Khalifa Al Thani, born to his second spouse, Moza bint Nasser, Moza bint Nassir. He became heir ...

. Also, it will create a straight and direct route between Saudi Arabia and Iran.

Iran–Oman Causeway

Iran proposed to build an overpass bridge over the

strait of Hormuz The Strait of Hormuz ( ''Tangeh-ye Hormoz'' , ''Maḍīq Hurmuz'') is a strait between the Persian Gulf and the Gulf of Oman. It provides the only sea passage from the Persian Gulf to the open ocean and is one of the world's most strategica ...

that will link Iran economically to GCC countries and Yemen through 39 km road link between Oman's Musandam exclave and southern Iran. The idea was having the support of Iranian Ambassador to Oman Ali Akbar Sibeveih.

Persian Gulf Bridge

The Persian Gulf Bridge in Qeshm– Bandar Abbas (

) will be a long road-rail bridge, connecting Qeshm Island to mainland

, from the historic port of Laft to Pahal port in Bandar Abbas ( Hormozgan Province). It was proposed to build an

instead of a bridge, but was rejected due to high costs.

Masirah island Bridge

In 2010, Oman's ruler, Sultan Qaboos bin Saeed, asked the government to plan for the construction of a bridge connecting Masirah Island on Oman's eastern coast to the mainland in a railroad.

Saudi Arabia–Pakistan

The Saudis were exploring two options to build a 400 km tunnel or bridge to link

Gwadar Gwadar (, ) is a Port, port city on the southwestern coast of the Administrative units of Pakistan, Pakistani province of Balochistan, Pakistan, Balochistan. The city is located on the shores of the Arabian Sea, opposite Oman and has a populati ...

(in

) with

Muscat Muscat (, ) is the capital and most populous city in Oman. It is the seat of the Governorate of Muscat. According to the National Centre for Statistics and Information (NCSI), the population of the Muscat Governorate in 2022 was 1.72 million. ...

(in

Oman Oman, officially the Sultanate of Oman, is a country located on the southeastern coast of the Arabian Peninsula in West Asia and the Middle East. It shares land borders with Saudi Arabia, the United Arab Emirates, and Yemen. Oman’s coastline ...

) at the mouth of

Strait of Hormuz The Strait of Hormuz ( ''Tangeh-ye Hormoz'' , ''Maḍīq Hurmuz'') is a strait between the Persian Gulf and the Gulf of Oman. It provides the only sea passage from the Persian Gulf to the open ocean and is one of the world's most strategica ...

at one end. The objective was to bypass its trade routes (including for oil supplies) with Iran and Qatar, because of the

Iran–Saudi Arabia proxy conflict Iran and Saudi Arabia are engaged in a proxy conflict over influence in the Middle East and other regions of the Muslim world. The two countries have provided varying degrees of support to opposing sides in nearby conflicts, including the civil wa ...

, also to extend the Chinese Belt and Road Initiative.

United Arab Emirates–India Tunnel

A tunnel, carrying

Maglev Maglev (derived from '' magnetic levitation'') is a system of rail transport whose rolling stock is levitated by electromagnets rather than rolled on wheels, eliminating rolling resistance. Compared to conventional railways, maglev trains h ...

trains, is planned to connect

’s biggest city

Mumbai Mumbai ( ; ), also known as Bombay ( ; its official name until 1995), is the capital city of the Indian state of Maharashtra. Mumbai is the financial capital and the most populous city proper of India with an estimated population of 12 ...

and emirate

Fujairah Fujairah City () is the capital of the emirate of Fujairah in the United Arab Emirates. It is the List of cities in the United Arab Emirates, seventh-largest city in UAE, located on the Gulf of Oman (part of the Indian Ocean). It is the only Em ...

(

United Arab Emirates The United Arab Emirates (UAE), or simply the Emirates, is a country in West Asia, in the Middle East, at the eastern end of the Arabian Peninsula. It is a Federal monarchy, federal elective monarchy made up of Emirates of the United Arab E ...

) through the

Arabian Sea The Arabian Sea () is a region of sea in the northern Indian Ocean, bounded on the west by the Arabian Peninsula, Gulf of Aden and Guardafui Channel, on the northwest by Gulf of Oman and Iran, on the north by Pakistan, on the east by India, and ...

in a

high-speed rail High-speed rail (HSR) is a type of rail transport network utilising trains that run significantly faster than those of traditional rail, using an integrated system of specialised rolling stock and dedicated railway track, tracks. While there is ...

way line to transport passengers, tourists and workers in just 2 hours. It had the support of Abdullah Alshehhi, chief consultant of

Abu Dhabi Abu Dhabi is the capital city of the United Arab Emirates. The city is the seat of the Abu Dhabi Central Capital District, the capital city of the Emirate of Abu Dhabi, and the UAE's List of cities in the United Arab Emirates, second-most popu ...

National Advisory Office (a Masdar City-based consultancy), and the

Gulf Cooperation Council The Cooperation Council for the Arab States of the Gulf (), also known as the Gulf Cooperation Council (GCC; ), is a Regional integration, regional, intergovernmental organization, intergovernmental, political, and economic union comprising Ba ...

. It is considered the longest submarine tunnel project in the world and will have a depth of 15,000 feet below the surface of the

Indian Ocean The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or approximately 20% of the water area of Earth#Surface, Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia (continent), ...

. Also,

Karachi Karachi is the capital city of the Administrative units of Pakistan, province of Sindh, Pakistan. It is the List of cities in Pakistan by population, largest city in Pakistan and 12th List of largest cities, largest in the world, with a popul ...

(Pakistan) and Muscat (Oman) are also included future plans of train stations, making provision for a road to be constructed within the tunnel for cars and trucks as well as a floating hotel, shopping centres and fuel stations, featuring pipelines for oil and water. Expansion of the project might include the One Belt One Road Initiative, linking China to Pakistan economic corridor at Gwadar Port with

UAE The United Arab Emirates (UAE), or simply the Emirates, is a country in West Asia, in the Middle East, at the eastern end of the Arabian Peninsula. It is a federal elective monarchy made up of seven emirates, with Abu Dhabi serving as i ...

, through the Fujairah port to complement the Chinese silk road.

Seikan tunnel

One of the longest tunnels in the world and - depending on definitions (total length versus length actually under water) - either the longest or the second longest underwater tunnel ahead or behind of the Channel Tunnel, the Seikan Tunnel links Japan's northernmost main island Hokkaido to Honshu. Initially only built to Cape gauge, the rail line running through the tunnel has since been converted to dual gauge to allow

standard gauge A standard-gauge railway is a railway with a track gauge of . The standard gauge is also called Stephenson gauge (after George Stephenson), international gauge, UIC gauge, uniform gauge, normal gauge in Europe, and SGR in East Africa. It is the ...

services, particularly

Shinkansen The , colloquially known in English as the bullet train, is a network of high-speed railway lines in Japan. It was initially built to connect distant Japanese regions with Tokyo, the capital, to aid economic growth and development. Beyond lon ...

. The ''Tōya Maru'' accident of 1954, in which a train ferry sank in a typhoon, killing over a thousand people, was a major factor in tilting the decision towards construction of the tunnel. The tunnel opened in 1988 and Hokkaido Shinkansen started running through it in 2016.

Bataan–Cavite Interlink Bridge

The

is planning to build a bridge that will span

Manila Bay Manila Bay (; ) is a natural harbor that serves the Port of Manila (on Luzon), in the Philippines. Strategically located around the Manila, capital city of the Philippines, Manila Bay facilitated commerce and trade between the Philippines and ...

and connect the provinces of

Bataan Bataan (, , , ; ) , officially the Province of Bataan, is a province in the Central Luzon region of the Philippines. Its capital is the city of Balanga while Mariveles is the largest town in the province. Occupying the entire Bataan Peninsula ...

and

Cavite Cavite, officially the Province of Cavite (; Chavacano: ''Provincia de Cavite''), is a Provinces of the Philippines, province of the Philippines located in the Calabarzon region. On the southern shores of Manila Bay and southwest of Manila, i ...

. The Bataan–Cavite Interlink Bridge, once completed, will be long and will consist of two cable-stayed bridges, with a span of each. The

National Economic and Development Authority The Department of Economy, Planning, and Development (DEPDev; ) is the executive department of the Philippine government responsible for national and regional economic policy, development, monitoring, and planning. DEPDev also oversees the pl ...

(NEDA) approved the bridge project in early 2020 with a budget of . The implementation of the bridge project is projected to last six years. In October 2020, the

Department of Public Works and Highways The Department of Public Works and Highways (DPWH; ) is the executive department of the Philippine government responsible for serving as the country's engineering and construction arm. It is tasked with implementing the government's policy to ...

(DPWH) signed a $59 million engineering design contract, awarded to the joint venture of T. Y. Lin International from the US and Korea's Pyunghwa Engineering Consultants Ltd., who are working in tandem with Geneva-based Renardet S.A. and local firm DCCD Engineering Corporation. As of March 2023, the project's detailed engineering design is already 70% complete, according to DPWH. The construction of the bridge is targeted to start in late 2023.

Asia to America

Bering Strait bridge or tunnel

There is a proposal to span the

Bering Sea The Bering Sea ( , ; rus, Бе́рингово мо́ре, r=Béringovo móre, p=ˈbʲerʲɪnɡəvə ˈmorʲe) is a marginal sea of the Northern Pacific Ocean. It forms, along with the Bering Strait, the divide between the two largest landmasse ...

with a bridge or tunnel called the Intercontinental Peace Bridge, the TKM-World Link or the AmerAsian Peace Tunnel. This would link the American Cape Prince of Wales with the

Cape Dezhnev Cape Dezhnyov or Cape Dezhnev (; ; Iñupiaq language, Inupiaq: ''Nuuġaq''), formerly known as East Cape or Cape Vostochny, is a Cape (geography), cape that forms the easternmost mainland point of Asia. It is located on the Chukchi Peninsula i ...

. The link would consist of three tunnels connecting

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

and Russia via two islands: Little Diomede (USA) and Big Diomede (Russia). The longest single tunnel would be . Since the

at the site of the proposed crossing has a maximum known depth of , the tunnels might be dug with conventional

tunnel boring machine A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. TBMs are an alternative to drilling and blasting methods and "hand mining", allowing more rapid excavation through hard rock, wet or dry so ...

s of the type used to build the Channel Tunnel. The three tunnel proposal is considered to be preferable over a bridge due to severe environmental conditions, especially the inescapable winter ice damage. Each proposed tunnel would be shorter than some current tunnels. The Channel Tunnel linking England with mainland Europe is about long; the Seikan Tunnel, an ocean tunnel linking

with

in Japan is long; and the Swiss

Gotthard Base Tunnel The Gotthard Base Tunnel (GBT; , , ) is a railway tunnel through the Alps in Switzerland. It opened in June 2016 and full service began the following December. With a route length of , it is the world's longest railway and deepest traffic tunn ...

through the

Alps The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. ...

, opened in 2016, is long. For a bridge or tunnel to be useful, a road or railway must be built to connect it, despite the very difficult climate and very sparse local population. In Alaska, a link would be needed, and in Russia, a link more than long must be constructed. Until around 2010, such road connections were suggested by enthusiasts only, but at that time both the Russian government and the Alaskan state government started to consider such roads. The

Alaska Railroad The Alaska Railroad is a Class II railroad that operates freight and passenger trains in the state of Alaska. The railroad's mainline runs between Seward, Alaska, Seward on the southern coast and Fairbanks, Alaska, Fairbanks, near the center of ...

is currently the only railroad in Alaska, and is not connected to the wider North American rail network, but plans for an A2A Railway linking it to

Alberta, Canada Alberta is a Provinces and territories of Canada, province in Canada. It is a part of Western Canada and is one of the three Canadian Prairies, prairie provinces. Alberta is bordered by British Columbia to its west, Saskatchewan to its east, t ...

and from there to the rest of the North American rail network are under consideration.

Asia to Oceania

There are no viable options for a fixed link between Asia and

Oceania Oceania ( , ) is a region, geographical region including Australasia, Melanesia, Micronesia, and Polynesia. Outside of the English-speaking world, Oceania is generally considered a continent, while Mainland Australia is regarded as its co ...

. Excluding the

Indonesia–Papua New Guinea border The Indonesia–Papua New Guinea border is the international border between Indonesia and Papua New Guinea. The border, which divides the island of New Guinea in half, consists of two straight north–south lines connected by a short section runn ...

that divides the island of

New Guinea New Guinea (; Hiri Motu: ''Niu Gini''; , fossilized , also known as Papua or historically ) is the List of islands by area, world's second-largest island, with an area of . Located in Melanesia in the southwestern Pacific Ocean, the island is ...

, the shortest distances between

Southeast Asia Southeast Asia is the geographical United Nations geoscheme for Asia#South-eastern Asia, southeastern region of Asia, consisting of the regions that are situated south of China, east of the Indian subcontinent, and northwest of the Mainland Au ...

and Oceania still cover a significant distance across the sea between

and

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

. The closest would be

Badu Island Badu or Badu Island (; , ; also Mulgrave Island), is an island in the Torres Strait north of Thursday Island, Queensland, Australia. Badu Island is also a suburbs and localities (Australia), locality in the Torres Strait Island Region, and Waka ...

Queensland Queensland ( , commonly abbreviated as Qld) is a States and territories of Australia, state in northeastern Australia, and is the second-largest and third-most populous state in Australia. It is bordered by the Northern Territory, South Austr ...

Torres Strait Islands The Torres Strait Islands are an archipelago of at least 274 small islands in the Torres Strait, a waterway separating far northern continental Australia's Cape York Peninsula and the island of New Guinea. They span an area of , but their tot ...

, which is away from

Merauke Regency Merauke Regency is a Regencies of Indonesia, regency in the far south of the Indonesian province of South Papua. It covers an area of 45,013.35 km2, and had a population of 195,716 at the 2010 CensusBiro Pusat Statistik, Jakarta, 2011. and 2 ...

's coastal border with Papua New Guinea. Otherwise, in the

Arafura Sea The Arafura Sea (or Arafuru Sea) lies west of the Pacific Ocean, overlying the continental shelf between Australia and Western New Guinea (also called Papua), which is the Indonesian part of the Island of New Guinea. Geography The Arafura Sea is ...

, Rimbija Island in the

Northern Territory The Northern Territory (abbreviated as NT; known formally as the Northern Territory of Australia and informally as the Territory) is an states and territories of Australia, Australian internal territory in the central and central-northern regi ...

's uninhabited Wessel Islands is south of Yos Sudarso Island, also in Merauke Regency; and across the

Timor Sea The Timor Sea (, , or ) is a relatively shallow sea in the Indian Ocean bounded to the north by the island of Timor with Timor-Leste to the north, Indonesia to the northwest, Arafura Sea to the east, and to the south by Australia. The Sunda Tr ...

, the northern tip of Melville Island is still south of Selaru in the

Tanimbar Islands The Tanimbar Islands (; ), also called ''Timur Laut'' (literally, "North East"; ), are a group of about 65 islands in the Maluku province of Indonesia. The largest and most central of the islands is Yamdena; others include Selaru to the sout ...

of Maluku.

Oceania

Australia–Papua New Guinea Tunnel

A tunnel/bridge between the

Australian mainland Mainland Australia is the main landmass of the Australia (continent), Australian continent, excluding the Aru Islands Regency, Aru Islands, New Guinea, Tasmania, and other list of islands of Australia, Australian offshore islands. The landmass ...

and the island of

, bridging the

Torres Strait The Torres Strait (), also known as Zenadh Kes ( Kalaw Lagaw Ya#Phonology 2, �zen̪ad̪ kes, is a strait between Australia and the Melanesian island of New Guinea. It is wide at its narrowest extent. To the south is Cape York Peninsula, ...

, is not considered economically feasible owing to the great distance. Cape York in northern Queensland is 140 km away from

. This is a very long distance compared to existing tunnels or bridges, and the demand for car travel is not so high; as of 2009 there are no car ferries between Australia and

. Passenger travel is by air or private boat only.

Cook Strait

The

Cook Strait Cook Strait () is a strait that separates the North Island, North and South Islands of New Zealand. The strait connects the Tasman Sea on the northwest with the South Pacific Ocean on the southeast. It is wide at its narrowest point,McLintock, ...

between

North Island The North Island ( , 'the fish of Māui', historically New Ulster) is one of the two main islands of New Zealand, islands of New Zealand, separated from the larger but less populous South Island by Cook Strait. With an area of , it is the List ...

and

South Island The South Island ( , 'the waters of Pounamu, Greenstone') is the largest of the three major islands of New Zealand by surface area, the others being the smaller but more populous North Island and Stewart Island. It is bordered to the north by ...

New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

has been suggested for a fixed link. The length would be at least 22 km, and the water depth is around 200 meters. This is mostly considered a too complicated and costly project to be realised.

The Americas

Vancouver Island

Ferry services link

Vancouver Island Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is in length, in width at its widest point, and in total area, while are of land. The island is the largest ...

British Columbia British Columbia is the westernmost Provinces and territories of Canada, province of Canada. Situated in the Pacific Northwest between the Pacific Ocean and the Rocky Mountains, the province has a diverse geography, with rugged landscapes that ...

on the Canadian Mainland and to the

State of Washington Washington, officially the State of Washington, is a state in the Pacific Northwest region of the United States. It is often referred to as Washington State to distinguish it from the national capital, both named after George Washington ...

in the US. Proposals have been made for a fixed link to Vancouver Island for over a century. Because of the extreme depth and soft seabed of the

Georgia Strait The Strait of Georgia () or the Georgia Strait is an arm of the Salish Sea between Vancouver Island and the extreme southwestern mainland coast of British Columbia, Canada, and the extreme northwestern mainland coast of Washington (state), Wash ...

, and the potential for seismic activity, a bridge or tunnel would face monumental engineering, safety, and environmental challenges at a prohibitive cost.

Prince Edward Island

Prince Edward Island Prince Edward Island is an island Provinces and territories of Canada, province of Canada. While it is the smallest province by land area and population, it is the most densely populated. The island has several nicknames: "Garden of the Gulf", ...

is linked to

New Brunswick New Brunswick is a Provinces and Territories of Canada, province of Canada, bordering Quebec to the north, Nova Scotia to the east, the Gulf of Saint Lawrence to the northeast, the Bay of Fundy to the southeast, and the U.S. state of Maine to ...

on the Canadian mainland by the

Confederation Bridge The Confederation Bridge () is a box girder bridge carrying the Trans-Canada Highway across the Abegweit Passage of the Northumberland Strait, linking the province of Prince Edward Island with the mainland province of New Brunswick. Opened ...

which opened in 1997.

Newfoundland

Various proposals have been considered for a fixed link consisting of bridges, tunnels, and/or causeways across the

Strait of Belle Isle The Strait of Belle Isle ( ; ) is a waterway in eastern Canada, that separates Labrador from the island of Newfoundland (island), Newfoundland, in the province of Newfoundland and Labrador. Location The strait is located in the southeast of the ...

, connecting the Province of Newfoundland and Labrador's mainland

Labrador Labrador () is a geographic and cultural region within the Canadian province of Newfoundland and Labrador. It is the primarily continental portion of the province and constitutes 71% of the province's area but is home to only 6% of its populatio ...

region with the island of

Newfoundland Newfoundland and Labrador is the easternmost province of Canada, in the country's Atlantic region. The province comprises the island of Newfoundland and the continental region of Labrador, having a total size of . As of 2025 the population ...

. This strait has a minimum width of .

Long Island

Nine bridges and 13 tunnels (including railroad tunnels) connect the

New York City New York, often called New York City (NYC), is the most populous city in the United States, located at the southern tip of New York State on one of the world's largest natural harbors. The city comprises five boroughs, each coextensive w ...

boroughs of

Brooklyn Brooklyn is a Boroughs of New York City, borough of New York City located at the westernmost end of Long Island in the New York (state), State of New York. Formerly an independent city, the borough is coextensive with Kings County, one of twelv ...

and

Queens Queens is the largest by area of the Boroughs of New York City, five boroughs of New York City, coextensive with Queens County, in the U.S. state of New York (state), New York. Located near the western end of Long Island, it is bordered by the ...

, on

Long Island Long Island is a densely populated continental island in southeastern New York (state), New York state, extending into the Atlantic Ocean. It constitutes a significant share of the New York metropolitan area in both population and land are ...

, to

Manhattan Manhattan ( ) is the most densely populated and geographically smallest of the Boroughs of New York City, five boroughs of New York City. Coextensive with New York County, Manhattan is the County statistics of the United States#Smallest, larg ...

and

Staten Island Staten Island ( ) is the southernmost of the boroughs of New York City, five boroughs of New York City, coextensive with Richmond County and situated at the southernmost point of New York (state), New York. The borough is separated from the ad ...

and, via these, to Newark in

New Jersey New Jersey is a U.S. state, state located in both the Mid-Atlantic States, Mid-Atlantic and Northeastern United States, Northeastern regions of the United States. Located at the geographic hub of the urban area, heavily urbanized Northeas ...

and

The Bronx The Bronx ( ) is the northernmost of the five Boroughs of New York City, boroughs of New York City, coextensive with Bronx County, in the U.S. state of New York (state), New York. It shares a land border with Westchester County, New York, West ...

on the mainland of

New York New York most commonly refers to: * New York (state), a state in the northeastern United States * New York City, the most populous city in the United States, located in the state of New York New York may also refer to: Places United Kingdom * ...

state. However, no fixed crossing of the

Long Island Sound Long Island Sound is a sound (geography), marine sound and tidal estuary of the Atlantic Ocean. It lies predominantly between the U.S. state of Connecticut to the north and Long Island in New York (state), New York to the south. From west to east, ...

exists east of New York City; most traffic from the mainland United States must pass through the city to access Long Island. Passenger and auto ferries connect Suffolk County on Long Island northward across the Sound to the mainland of

state and eastward to the state of

Connecticut Connecticut ( ) is a U.S. state, state in the New England region of the Northeastern United States. It borders Rhode Island to the east, Massachusetts to the north, New York (state), New York to the west, and Long Island Sound to the south. ...

. There have been various proposals, none successful, to replace these ferries with a fixed link across Long Island Sound to provide an alternate route around New York City for Long Island-bound traffic.

Delmarva

The

Chesapeake Bay Bridge–Tunnel The Chesapeake Bay Bridge–Tunnel (CBBT, officially the Lucius J. Kellam Jr. Bridge–Tunnel) is a bridge–tunnel that crosses the mouth of the Chesapeake Bay between Delmarva and Hampton Roads in the U.S. commonwealth of Virginia. It ope ...

(CBBT) is a fixed link crossing the mouth of the United States'

Chesapeake Bay The Chesapeake Bay ( ) is the largest estuary in the United States. The bay is located in the Mid-Atlantic (United States), Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula, including parts of the Ea ...

, connecting the

Delmarva Peninsula The Delmarva Peninsula, or simply Delmarva, is a peninsula on the East Coast of the United States, occupied by the majority of the state of Delaware and parts of the Eastern Shore of Maryland and Eastern Shore of Virginia. The peninsula is l ...

with

Virginia Beach, Virginia Virginia Beach (colloquially VB) is the most populous city in the U.S. commonwealth of Virginia. The city is located on the Atlantic Ocean at the mouth of the Chesapeake Bay in southeastern Virginia. It is the sixth-most populous city in the ...

. It opened in 1964.

Overseas Highway

The

Overseas Highway The Overseas Highway is a highway carrying U.S. Route 1 (US 1) through the Florida Keys to Key West. Large parts of it were built on the former right-of-way of the Overseas Railroad, the Key West Extension of the Florida East Coast Ra ...

is a highway carrying U.S. Route 1 (US 1) through the

Florida Keys The Florida Keys are a coral island, coral cay archipelago off the southern coast of Florida, forming the southernmost part of the continental United States. They begin at the southeastern coast of the Florida peninsula, about south of Miami a ...

Key West Key West is an island in the Straits of Florida, at the southern end of the U.S. state of Florida. Together with all or parts of the separate islands of Dredgers Key, Fleming Key, Sunset Key, and the northern part of Stock Island, it con ...

Florida to Bahamas, Cuba, Hispaniola, and Puerto Rico

Ferry services between the US and Cuba and between Cuba and Haiti were common before 1960, but were suspended due to the

United States embargo against Cuba The United States embargo against Cuba is the only active embargo within the United States which has prevented U.S. businesses from conducting trade or commerce with Cuban interests since 1958. Modern Cuba–United States relations, diplomatic ...

. After the normalization of U.S.-Cuba diplomatic relations by U.S. President

Barack Obama Barack Hussein Obama II (born August 4, 1961) is an American politician who was the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president in American history. O ...

and Cuban President

Raúl Castro Raúl Modesto Castro Ruz ( ; ; born 3 June 1931) is a Cuban retired politician and general who served as the First Secretary of the Communist Party of Cuba, first secretary of the Communist Party of Cuba, the most senior position in the One-par ...

, some American companies began plans to provide regular ferry services between

Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

and Cuba. However, President

Donald Trump Donald John Trump (born June 14, 1946) is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party (United States), Republican Party, he served as the 45 ...

reinstated many travel restrictions towards Cuba during his term, including prohibition of direct ferry services. There is only one regular ferry to

Havana Havana (; ) is the capital and largest city of Cuba. The heart of La Habana Province, Havana is the country's main port and commercial center.Cancún Cancún is the most populous city in the Mexican state of Quintana Roo, located in southeast Mexico on the northeast coast of the Yucatán Peninsula. It is a significant tourist destination in Mexico and the seat of the municipality of Benito J ...

Mexico Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...

. A ferry travels between Mayagüez in

Puerto Rico ; abbreviated PR), officially the Commonwealth of Puerto Rico, is a Government of Puerto Rico, self-governing Caribbean Geography of Puerto Rico, archipelago and island organized as an Territories of the United States, unincorporated territo ...

and

Santo Domingo Santo Domingo, formerly known as Santo Domingo de Guzmán, is the capital and largest city of the Dominican Republic and the List of metropolitan areas in the Caribbean, largest metropolitan area in the Caribbean by population. the Distrito Na ...

in the

Dominican Republic The Dominican Republic is a country located on the island of Hispaniola in the Greater Antilles of the Caribbean Sea in the Atlantic Ocean, North Atlantic Ocean. It shares a Maritime boundary, maritime border with Puerto Rico to the east and ...

. There have been proposals for a direct link between

(US) to

Havana Havana (; ) is the capital and largest city of Cuba. The heart of La Habana Province, Havana is the country's main port and commercial center.Florida Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic ...

and

The Bahamas The Bahamas, officially the Commonwealth of The Bahamas, is an Archipelagic state, archipelagic and island country within the Lucayan Archipelago of the Atlantic Ocean. It contains 97 per cent of the archipelago's land area and 88 per cent of ...

Ceiba–Vieques Bridge

On 2009, there was a proposal to build a bridge between

Ceiba ''Ceiba'' is a genus of trees in the family Malvaceae, native to Tropics, tropical and Subtropics, subtropical areas of the Americas (from Mexico and the Caribbean to northern Argentina) and tropical West Africa. Some species can grow to tall ...

(on

island) and Vieques island, having an estimated cost of $600 million. The main goal was to cut travel time to and from the small island town that is currently served by daily ferry runs.

Gulf of Paria crossing

After the independence of

Trinidad and Tobago Trinidad and Tobago, officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean, comprising the main islands of Trinidad and Tobago, along with several List of islands of Trinidad and Tobago, smaller i ...

, members in the government have spoken of constructing a physical link between the islands of

Trinidad Trinidad is the larger, more populous island of the Republic of Trinidad and Tobago, the country. The island lies off the northeastern coast of Venezuela and sits on the continental shelf of South America. It is the southernmost island in ...

and

Tobago Tobago, officially the Ward of Tobago, is an List of islands of Trinidad and Tobago, island and Regions and municipalities of Trinidad and Tobago, ward within the Republic of Trinidad and Tobago. It is located northeast of the larger islan ...

, wanting to physically unify the country. As public discussion and commentary ensued over feasibility and cost, an alternative proposal of a Gulf of Paria crossing was made of constructing a shorter connection which would connect Trinidad and

Venezuela Venezuela, officially the Bolivarian Republic of Venezuela, is a country on the northern coast of South America, consisting of a continental landmass and many Federal Dependencies of Venezuela, islands and islets in the Caribbean Sea. It com ...

. In 2017, China showed interest in the construction of a mega bridge in the Caribbean Sea to connect Tobago and Trinidad. On modern times, there have been studies from the Department of Civil & Environmental Engineering, from

University of the West Indies The University of the West Indies (UWI), originally University College of the West Indies, is a public university system established to serve the higher education needs of the residents of 18 English-speaking countries and territories in t ...

at St. Augustine, that have developed studies for a possible bridge linking between Venezuela and Tobago, but only as case study, without official support.

Maracaibo Crossing

In Venezuela, the

General Rafael Urdaneta Bridge The General Rafael Urdaneta Bridge is located at the Tablazo Strait outlet of Lake Maracaibo, in western Venezuela. The bridge connects Maracaibo with much of the rest of the country. It is named after General Rafael Urdaneta, a Venezuelan hero ...

connects

Maracaibo Maracaibo ( , ; ) is a city and municipality in northwestern Venezuela, on the western shore of the strait that connects Lake Maracaibo to the Gulf of Venezuela. It is the largest city in Venezuela and is List of cities in Venezuela by population ...

with much of the rest of the country, being a bridge that crosses the narrowest part of

Lake Maracaibo Lake Maracaibo () is located in northwestern Venezuela, between the states of Zulia, Trujillo, and Mérida. While Maracaibo is commonly referred to as a lake, its current hydrological characteristics may better classify it as estuary and/or ...

, in

Zulia Zulia State (, ; Wayuu: ''Mma’ipakat Suuria'') is one of the 23 states of Venezuela. The state capital is Maracaibo. As of the 2011 census, it has a population of 3,704,404, the largest population among Venezuela's states. It is also one of t ...

(northwestern Venezuela). There is another plan of a Second bridge over Lake Maracaibo for the construction of a mixed road-rail bridge that would link the Zulia cities of Santa Cruz de Mara and Punta de Palmas, located on both sides of Lake Maracaibo, in the Miranda Municipality.

Darién Gap

A notable break in the

Pan-American Highway The Pan-American Highway is a vast network of roads that stretches about 30,000 kilometers (about 19,000 miles) from Prudhoe Bay, Alaska, in the northernmost part of North America to Ushuaia, Argentina, at the southern tip of South America. I ...

is a section of land located in the

Darién Province Darién (, ; ) is a Provinces of Panama, province in Panama whose capital city is La Palma, Darién, La Palma. With an area of , it is located at the eastern end of the country and bordered to the north by the province of Panamá Province, Panam ...

in Panama and the

Colombia Colombia, officially the Republic of Colombia, is a country primarily located in South America with Insular region of Colombia, insular regions in North America. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuel ...

n border called the

Darién Gap The Darién Gap (, , ) is a geographic region that connects the Americas, American continents, stretching across southern Panama's Darién Province and the northern portion of Colombia's Chocó Department. Consisting of a large drainage basin, ...

. It is an stretch of rainforest. The gap has been crossed by adventurers on bicycle, motorcycle,

all-terrain vehicle An all-terrain vehicle (ATV), also known as a light utility vehicle (LUV), a quad bike or quad (if it has four wheels), as defined by the American National Standards Institute (ANSI), is a vehicle that travels on low-pressure tires, has a seat ...

, and foot, dealing with jungle, swamp, insects, kidnapping, and other hazards. Some people, groups, indigenous populations, and governments are opposed to completing the Darién portion of the highway. Reasons for opposition include protecting the rain forest, containing the spread of tropical diseases, protecting the livelihood of indigenous peoples in the area, and reducing the spread of drug trafficking and its associated violence from Colombia.

Santa Catarina Island

The Hercilio Luz Bridge is the first bridge constructed to link the Island of Santa Catarina to the mainland

Brazil Brazil, officially the Federative Republic of Brazil, is the largest country in South America. It is the world's List of countries and dependencies by area, fifth-largest country by area and the List of countries and dependencies by population ...

. Two additional crossings connecting the island to the mainland exist: Colombo Salles Bridge and Pedro Ivo Campos Bridge.

Chacao Channel bridge

It's a construction project for a bridge that will cross the

Chacao Channel The Chacao Channel () is located in Los Lagos Region, Chile and separates Chiloé Island from mainland Chile. The channel is about 40 km long and 4 km wide and connects the Pacific Ocean and Gulf of Ancud. The channel was created during the Quat ...

. It is intended to unite the Isla Grande de Chiloé with the Chilean continental territory, in the

Los Lagos Region Los Lagos Region ( , 'Region of the Lakes') is one of regions of Chile, Chile's 16 regions, which are first order administrative divisions, and comprises four provinces: Chiloé Province, Chiloé, Llanquihue Province, Llanquihue, Osorno Provin ...

. The opening of the bridge is planned for 2025. It will be the longest suspension bridge in Latin America. Previously there were suggestion of a connection by tunnel, but were rejected due to financial problems.

Terrestrial connection project through the Río de la Plata

At the end of the 19th century, Argentine President

Domingo Sarmiento Domingo Faustino Sarmiento (15 February 1811 – 11 September 1888) was President of Argentina from 1868 to 1874. He was a member of a group of intellectuals, known as the ''1837 generation, Generation of 1837'', who had a great influence on 19t ...

presented the " Argirópolis" project; which included building railway bridges uniting both countries through the Martín García island. Several land connection projects through the

Río de la Plata The Río de la Plata (; ), also called the River Plate or La Plata River in English, is the estuary formed by the confluence of the Uruguay River and the Paraná River at Punta Gorda, Colonia, Punta Gorda. It empties into the Atlantic Ocean and ...

were evaluated by the governments of

Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of South American countries by area, second-largest country in South America after Brazil, the fourt ...

and

Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...

(also

Mercosur The Southern Common Market (commonly known by abbreviation ''Mercosur'' in Spanish and ''Mercosul'' in Portuguese) is a South American trade bloc established by the Treaty of Asunción in 1991 and Protocol of Ouro Preto in 1994. Its full me ...

), with the objective of erecting a road for vehicular, rail or both types of transit. Although most of the proposals involve the construction of bridges, others also mention sub-fluvial tunnels as a possible alternative. The project would consist to link

Colonia del Sacramento Colonia del Sacramento (; ) is a city in southwestern Uruguay, by the Río de la Plata, facing Buenos Aires, Argentina. It is one of the oldest towns in Uruguay and the capital of the Colonia Department. As of the 2023 census, it has a populatio ...

in Uruguay to

Punta Lara Punta Lara is a city located in the Ensenada Partido, in Buenos Aires Province, Argentina Argentina, officially the Argentine Republic, is a country in the southern half of South America. It covers an area of , making it the List of Sou ...

in Argentina.

Transatlantic tunnel

A transatlantic tunnel is a theoretical tunnel that would span the Atlantic Ocean between North America and Europe, perhaps enabling mass transit. Some proposals envision technologically advanced trains reaching speeds of . Most conceptions of the tunnel envision it between the United States and the United Kingdom ‒ or more specifically between New York City and London. Advantages compared to air travel would be increased speed and use of electricity instead of oil-based fuel. The main barriers to constructing such a tunnel are cost, with estimates of between $88 billion and $175 billion, as well as the limits of current

materials science Materials science is an interdisciplinary field of researching and discovering materials. Materials engineering is an engineering field of finding uses for materials in other fields and industries. The intellectual origins of materials sci ...

. The proposed routes are a direct link from the US to Europe, or from the US, crossing

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

Greenland Greenland is an autonomous territory in the Danish Realm, Kingdom of Denmark. It is by far the largest geographically of three constituent parts of the kingdom; the other two are metropolitan Denmark and the Faroe Islands. Citizens of Greenlan ...

Iceland Iceland is a Nordic countries, Nordic island country between the Atlantic Ocean, North Atlantic and Arctic Oceans, on the Mid-Atlantic Ridge between North America and Europe. It is culturally and politically linked with Europe and is the regi ...

and the

, to the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...

, using an underwater vacuum tube train. The

Maritime Research Institute Netherlands MARIN, the Maritime Research Institute Netherlands, is the leading institute in the world for hydrodynamic research and maritime technology. The services incorporate a unique combination of simulation, model testing, full-scale measurements and trai ...

(Marin), in 2019, tested a model trans-Atlantic underwater tunnel between the United States and Europe capable of supporting

hyperloop Hyperloop is a proposed high-speed transportation system for both passengers and freight. The concept was published by entrepreneur Elon Musk in a 2013 white paper, where the hyperloop was described as a transportation system using capsules supp ...

References

* "The Three Americas Railway: An International and Intercontinental Enterprise" book written in 1881 by Hinton Rowan Helper discusses the need for an Intercontinental Highway, using railroads, starting on page 418. * "The Rotarian", January 1936. Article "Seeking Peace in a Concrete Way" starting on page 42. * "Looking far north: the Harriman Expedition to Alaska, 1899" written in 1982 by William H. Goetzmann, Kay Sloan, writes that Harriman in 1899 proposed a "Round the World Railroad" (page 128). The authors go on to write that Harriman traveled to Japan a few years later to continue this proposal. * "The Bering Strait Crossing: A 21st Century Frontier Between East and West" by James Oliver published in 2006 (256 pages) mentions extensively the Intercontinental Highway. He goes on to mention that the notion of a global highway has been around for hundreds of years including William Gilpen, who suggests it in 1846 was a proponent of a global rail highway to link to the then being proposed European and Asiatic Railway. * "Planning and Design of Bridges" by M. S. Troitsky, 1994 describes many of the bridges and tunnels proposed in the Trans Global Highway article including on page 39 this book mentions that in 1958, T.Y. Lin mentions the possible construction of a Bering Strait bridge (and obviously a needed highway network). * Alaska History: A Publication of the Alaska Historical Society, Volumes 4-6 (1989) mentions on page 6 that in 1892, a man named Strauss proposed a global highway and a man made bridge over the Bering Strait. The article goes on to mention the Lin proposal of 1958. * "Maritime Information Review" a publication of the Netherlands Maritime Information Centre, in 1991 had an extensive article, on "strait crossings" covering the then proposed Bering Strait bridge, the Gibraltar Tunnel and so on, and mentions the proposed global highway network. * Popular Mechanics Apr 1994 has an article "Alaska Siberia Bridge" and the article goes on to mention the construction of a global highway.

External links

The Schiller Institute article on the Trans Global Highway
{{Webarchive, url=https://web.archive.org/web/20140419044419/http://www.schillerinstitute.org/economy/maps/maps3.html#bering%20straits , date=2014-04-19
Wikivoyage
Wikimedia's global travel guide with information on driving in each country Exploratory engineering Transportation planning Proposed undersea tunnels Proposed bridges Transcontinental crossings