The Turkish Straits () are two internationally significant waterways in northwestern

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 ...

. The Straits create a series of international passages that connect the Aegean and

Mediterranean The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern ...

seas to the

Black Sea The Black Sea is a marginal sea, marginal Mediterranean sea (oceanography), mediterranean sea lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bound ...

. They consist of 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 ...

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 straits are on opposite ends of 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 ...

. The straits and the Sea of Marmara are part of the sovereign sea territory of Turkey and are treated as Turkish internal waters. Located in the western part of the landmass of

Eurasia Eurasia ( , ) is a continental area on Earth, comprising all of Europe and Asia. According to some geographers, Physical geography, physiographically, Eurasia is a single supercontinent. The concept of Europe and Asia as distinct continents d ...

, the Straits are conventionally considered the boundary between the continents of

Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...

and

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

, as well as the dividing line between European Turkey and Asian Turkey. Owing to their strategic importance in international commerce, politics, and warfare, the Straits have played a significant role in European and world history. Since 1936, they have been governed in accordance with the Montreux Convention.

Geography

As maritime

waterway A waterway is any Navigability, navigable body of water. Broad distinctions are useful to avoid ambiguity, and disambiguation will be of varying importance depending on the nuance of the equivalent word in other ways. A first distinction is ...

s, the Turkish Straits connect various seas along the

Eastern Mediterranean The Eastern Mediterranean is a loosely delimited region comprising the easternmost portion of the Mediterranean Sea, and well as the adjoining land—often defined as the countries around the Levantine Sea. It includes the southern half of Turkey ...

, the

Balkans The Balkans ( , ), corresponding partially with the Balkan Peninsula, is a geographical area in southeastern Europe with various geographical and historical definitions. The region takes its name from the Balkan Mountains that stretch throug ...

, the

Near East The Near East () is a transcontinental region around the Eastern Mediterranean encompassing the historical Fertile Crescent, the Levant, Anatolia, Egypt, Mesopotamia, and coastal areas of the Arabian Peninsula. The term was invented in the 20th ...

, and Western Eurasia. Specifically, the Straits allows maritime connections from the

all the way to the Aegean and

Mediterranean Sea The Mediterranean Sea ( ) is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean basin and almost completely enclosed by land: on the east by the Levant in West Asia, on the north by Anatolia in West Asia and Southern Eur ...

s, the

Atlantic Ocean The Atlantic Ocean is the second largest of the world's five borders of the oceans, oceanic divisions, with an area of about . It covers approximately 17% of Earth#Surface, Earth's surface and about 24% of its water surface area. During the ...

via

Gibraltar Gibraltar ( , ) is a British Overseas Territories, British Overseas Territory and British overseas cities, city located at the southern tip of the Iberian Peninsula, on the Bay of Gibraltar, near the exit of the Mediterranean Sea into the A ...

, and 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), ...

through 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 ...

, making them crucial international waterways, in particular for the passage of goods coming in from

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 ...

The Turkish Straits are made up of the following waterways; * The ''

'' (also spelled ''Bosporus''; or , "

Istanbul Istanbul is the List of largest cities and towns in Turkey, largest city in Turkey, constituting the country's economic, cultural, and historical heart. With Demographics of Istanbul, a population over , it is home to 18% of the Demographics ...

Strait"), about long and only wide, connects the Sea of Marmara with the Black Sea in the north. It runs through the city of

, making it a city located on two continents. It is crossed by three suspension bridges (the Bosphorus Bridge, the Fatih Sultan Mehmet Bridge and 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 ...

), and two underwater tunnels (the Marmaray rail tunnel and the

road tunnel). There are plans for further crossings being debated at various stages. * The ''

'' (, "

Çanakkale Çanakkale is a city and seaport in Turkey on the southern shore of the Dardanelles at their narrowest point. It is the seat of Çanakkale Province and Çanakkale District.Çanakkale Çanakkale is a city and seaport in Turkey on the southern shore of the Dardanelles at their narrowest point. It is the seat of Çanakkale Province and Çanakkale District.classical antiquity Classical antiquity, also known as the classical era, classical period, classical age, or simply antiquity, is the period of cultural History of Europe, European history between the 8th century BC and the 5th century AD comprising the inter ...

, the Dardanelles strait was known as the Hellespont. The strait and the Gallipoli (''Gelibolu'') peninsula on its western shoreline were the scene of the Battle of Gallipoli during 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 ...

. The Çanakkale 1915 Bridge, which opened to traffic on 18 March 2022, connects the northwestern province of Çanakkale’s Gelibolu district on the European side and the Lapseki district on the Anatolian side, and is the first bridge to cross over the strait. Developments of economic activities threaten marine ecosystems including endemic

dolphin A dolphin is an aquatic mammal in the cetacean clade Odontoceti (toothed whale). Dolphins belong to the families Delphinidae (the oceanic dolphins), Platanistidae (the Indian river dolphins), Iniidae (the New World river dolphins), Pontopori ...

s and

harbour porpoise The harbour porpoise (''Phocoena phocoena'') is one of eight extant species of porpoise. It is one of the smallest species of cetacean. As its name implies, it stays close to coastal areas or river estuaries, and as such, is the most familiar ...

Straits Question

The Straits have had major maritime strategic importance since at least the Mycenaean period, and the narrow crossings between Asia and Europe have provided migration and invasion routes (for Persians, Galatians, and Turks, for example) for even longer. In the declining days of the

Ottoman Empire The Ottoman Empire (), also called the Turkish Empire, was an empire, imperial realm that controlled much of Southeast Europe, West Asia, and North Africa from the 14th to early 20th centuries; it also controlled parts of southeastern Centr ...

, the "Straits Question" involved the diplomats of Europe and the Ottomans. By the terms of the London Straits Convention concluded on 13 July 1841 between the Great Powers of

—

, 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 ...

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 ...

Austria Austria, formally the Republic of Austria, is a landlocked country in Central Europe, lying in the Eastern Alps. It is a federation of nine Federal states of Austria, states, of which the capital Vienna is the List of largest cities in Aust ...

and

Prussia Prussia (; ; Old Prussian: ''Prūsija'') was a Germans, German state centred on the North European Plain that originated from the 1525 secularization of the Prussia (region), Prussian part of the State of the Teutonic Order. For centuries, ...

— the "ancient rule" of the

was re-established by closing the Turkish straits to all

warship A warship or combatant ship is a naval ship that is used for naval warfare. Usually they belong to the navy branch of the armed forces of a nation, though they have also been operated by individuals, cooperatives and corporations. As well as b ...

s whatsoever, barring those of the

Ottoman Sultan The sultans of the Ottoman Empire (), who were all members of the Ottoman dynasty (House of Osman), ruled over the Boundaries between the continents, transcontinental empire from its perceived inception in 1299 to Dissolution of the Ottoman Em ...

's allies during wartime. This treaty became one in a series dealing with access to the Bosphorus, the Sea of Marmara, and the Dardanelles. It evolved from the secret 1833 Treaty of Hünkâr İskelesi (Unkiar Skelessi), in which the Ottoman Empire guaranteed exclusive use of the Straits to "Black Sea Powers" (i.e., Ottoman Empire and Russian Empire) warships in the case of a general war. Dardanelles landsat

The Straits became especially important in the course of

World War I 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 ...

(1914–1918) as a potential link between the Entente powers' Eastern and Western Fronts. Anglo-French naval forces failed to take control of the Dardanelles (February – March 1915), but in the secret Straits Agreement diplomacy of March – April 1915, the members of the

Triple Entente The Triple Entente (from French meaning "friendship, understanding, agreement") describes the informal understanding between the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland. It was built upon th ...

agreed — in the event of victory in

— to cede Ottoman territory controlling and overlooking the Straits to the Russian Empire. Anglo-French troops then launched the Gallipoli campaign, an ultimately unsuccessful operation to take control of the Straits following amphibious landings on the Gallipoli Peninsula (April 1915 to January 1916). The revolutions in Petrograd in 1917 ultimately stalled Russia's own plans to seize the Straits. On the Eastern Front , there were the Black Sea raid ,

Cape Sarych Sarych (; ; ) is a headland located on the shore of the Black Sea at the southern extremity of the Crimean Peninsula. About five kilometers east of the Sarych headland lies the resort town of Foros. The city of Sevastopol is located about a ...

, 10 May 1915, Kirpen, 8 January 1916. The modern treaty controlling access is the 1936 Montreux Convention Regarding the Regime of the Straits, which remains in force This Convention mandates that

Republic of 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 ...

allow the free passage of all civilian vessels in peacetime, and requires

to allow warships of some nations to traverse the straits in peacetime, but only under strict conditions – restrictions on number, size, length of stay if entering the

(if not a Black Sea power), advance notification to Turkey, and other conditions.

References

Sources

* {{Straits Question navbox International straits Straits of Turkey Straits of the Mediterranean Sea Water transport in Turkey

Geography

Straits Question

See also

References

Sources