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Borders are generally defined as geographical boundaries, imposed either by features such as
ocean The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as ''oceans'' (the Pacific, Atlantic, Indian Ocean, Indian, Southern Ocean ...
s and terrain, or by political entities such as
government A government is the system or group of people governing an organized community, generally a State (polity), state. In the case of its broad associative definition, government normally consists of legislature, executive (government), execu ...
s,
sovereign state A sovereign state is a State (polity), state that has the highest authority over a territory. It is commonly understood that Sovereignty#Sovereignty and independence, a sovereign state is independent. When referring to a specific polity, the ter ...
s,
federated state A federated state (also State (polity), state, province, region, Canton (administrative division), canton, Länder, land, governorate, oblast, emirate, or country) is a territorial and constitutional community forming part of a federation ...
s, and other subnational entities. Political borders can be established through warfare, colonization, or mutual agreements between the political entities that reside in those areas. Some borders—such as most states' internal administrative borders, or inter-state borders within the Schengen Area—are open and completely unguarded. Most external political borders are partially or fully controlled, and may be crossed legally only at designated border checkpoints; adjacent border zones may also be controlled. For the purposes of border control,
airport An airport is an aerodrome with extended facilities, mostly for commercial Aviation, air transport. They usually consist of a landing area, which comprises an aerially accessible open space including at least one operationally active surf ...
s and seaports are also classed as borders. Most countries have some form of border control to regulate or limit the movement of people, animals, and goods into and out of the country. Under international law, each country is generally permitted to legislate the conditions that have to be met in order to cross its borders, and to prevent people from crossing its borders in violation of those laws. Buffer zones may be set up on borders between belligerent entities to lower the risk of escalation. While ''border'' refers to the boundary itself, the area around the border is called the frontier.


History

In the pre-modern world, the term ''border'' was vague and could refer to either side of the boundary, thus it was necessary to specify part of it with ''borderline'' or ''borderland''. During the medieval period the government's control frequently diminished the further people got from the capital. Therefore borderland (especially impassable terrain) attracted many outlaws, as they often found sympathizers. In the past, many borders were not clearly defined lines; instead there were often intervening areas often claimed and fought over by both sides, sometimes called marchlands. Special cases in modern times were the Saudi Arabian–Iraqi neutral zone from 1922 to 1991 and the Saudi Arabian–Kuwaiti neutral zone from 1922 until 1970. In modern times, marchlands have been replaced by clearly defined and demarcated borders.


Classification


Political borders

Political borders are imposed on the world through human agency. That means that although a political border may follow a river or mountain range, such a feature does not automatically define the political border, even though it may be a major physical barrier to crossing. Political borders are often classified by whether or not they follow conspicuous physical features on the earth. William Miles said that Britain and France traced close to 40% of the entire length of the world's international boundaries.


Natural borders

Natural borders are geographical features that present natural obstacles to communication and transport. Existing political borders are often a formalization of such historical, natural obstacles. Some geographical features that often constitute natural borders are: *
Ocean The ocean is the body of salt water that covers approximately 70.8% of Earth. The ocean is conventionally divided into large bodies of water, which are also referred to as ''oceans'' (the Pacific, Atlantic, Indian Ocean, Indian, Southern Ocean ...
s: oceans create very costly natural borders. Very few countries span more than one
continent A continent is any of several large geographical regions. Continents are generally identified by convention (norm), convention rather than any strict criteria. A continent could be a single large landmass, a part of a very large landmass, as ...
. Only very large and resource-rich states are able to sustain the costs of governance across oceans for longer periods of time. *
River A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...
s: Some political borders have been formalized along natural borders formed by rivers. If a precise line is desired, it is often drawn along the thalweg, the deepest line along the river. *
Lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...
s: larger lakes create natural borders. * Forests: denser jungles or forests can create strong natural borders. *
Mountain range A mountain range or hill range is a series of mountains or hills arranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have aris ...
s: Many nations have their political borders defined along mountain ranges, often along a drainage divide. Throughout history, technological advances have reduced the costs of transport and communication across the natural borders. That has reduced the significance of natural borders over time. As a result, political borders that have been formalized more recently, such as those in Africa or Americas, typically conform less to natural borders than very old borders, such as those in Europe or Asia, do.


Landscape borders

A landscape border is a mixture of political and natural borders. One example is the defensive forest created by China's Song dynasty in the eleventh century. Such a border is political in the sense that it is human-demarcated, usually through a treaty. However, a landscape border is not demarcated by fences and walls but instead landscape features such as forests, mountains, and water bodies. It is different from a natural border, however, in the sense that the border landscape is not natural but human-engineered. Such a landscape usually differs from the borderland's natural geography and its building requires tremendous human labour and financial investment.


Geometric borders

Geometric boundaries are formed by straight lines (such as lines of latitude or longitude), or occasionally arcs (Pennsylvania/Delaware), regardless of the physical and cultural features of the area. Such political boundaries are often found around the states that developed out of colonial holdings, such as in
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
, Africa and the
Middle East The Middle East (term originally coined in English language) is a geopolitical region encompassing the Arabian Peninsula, the Levant, Turkey, Egypt, Iran, and Iraq. The term came into widespread usage by the United Kingdom and western Eur ...
. The Canada–United States border follows the 49th parallel for roughly from Lake of the Woods (
Ontario Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
and Minnesota) west to the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
.


Fiat borders

A generalization of the idea of geometric borders is the idea of fiat boundaries by which is meant any sort of boundary that does not track an underlying ''bona fide'' physical discontinuity (''fiat'',
Latin Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
for "let it be done", a decision). Fiat boundaries are typically the product of human demarcation, such as in demarcating electoral districts or postal districts.


Relic borders

A relic border is a former boundary, which may no longer be a legal boundary at all. However, the former presence of the boundary can still be seen in the landscape. For instance, the boundary between East and
West Germany West Germany was the common English name for the Federal Republic of Germany (FRG) from its formation on 23 May 1949 until German reunification, its reunification with East Germany on 3 October 1990. It is sometimes known as the Bonn Republi ...
is no longer an international boundary, but it can still be seen because of historical markers on the landscape; it remains a cultural and economic demarcation in
Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...
. Other examples include the Demilitarized Zone between North and South Vietnam (defunct since 1975) and the border between North and South Yemen (defunct since 1990). Occasionally a relic border is reconstituted in some form, for example the border between
British Somaliland British Somaliland, officially the Somaliland Protectorate (), was a protectorate of the United Kingdom in modern Somaliland. It was bordered by Italian Somalia, French Somali Coast and Ethiopian Empire, Abyssinia (Italian Ethiopia from 1936 ...
and Italian Somaliland ceased to exist when the two colonies merged to form the independent state of
Somalia Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, th ...
in 1960, however when the former British Somaliland declared independence in 1991 it claimed the former British-Italian line as its eastern border.


Lines of control

A line of control (LoC) refers to a militarized buffer border between two or more nations that has yet to achieve permanent border status. LoC borders are typically under military control and are not recognized as an official international border. Formally known as a cease-fire line, an LoC was first created with the Simla Agreement 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 ...
and
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# ...
. Similar to a cease-fire line, an LoC is typically the result of war, military stalemates and unresolved land ownership conflict.


Maritime borders

A maritime border is a division enclosing an area in the ocean where a nation has exclusive rights over the mineral and biological resources, encompassing maritime features, limits and zones. Maritime borders represent the jurisdictional borders of a maritime nation and are recognized by the United Nations Convention on the Law of the Sea. Maritime borders exist in the context of territorial waters, contiguous zones, and exclusive economic zones; however, the terminology does not encompass
lake A lake is often a naturally occurring, relatively large and fixed body of water on or near the Earth's surface. It is localized in a basin or interconnected basins surrounded by dry land. Lakes lie completely on land and are separate from ...
or
river A river is a natural stream of fresh water that flows on land or inside Subterranean river, caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of ...
boundaries, which are considered within the context of land boundaries. Some maritime borders have remained indeterminate despite efforts to clarify them. This is explained by an array of factors, some of which illustrate regional problems.


Airspace borders

Airspace is the
atmosphere An atmosphere () is a layer of gases that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A stellar atmosph ...
located within a country's controlled international and maritime borders. All sovereign countries hold the right to regulate and protect air space under the international law of Air sovereignty. The horizontal boundaries of airspace are similar to the policies of " high seas" in maritime law. Airspace extends 12 nautical miles from the coast of a country and it holds responsibility for protecting its own airspace unless under
NATO The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...
peacetime protection. With international agreement a country can assume the responsibility of protecting or controlling the atmosphere over International Airspaces such as the
Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...
. The vertical boundaries of airspace are not officially set or regulated internationally. However, there is a general agreement of vertical airspace ending at the point of the Kármán line. The Kármán line is a peak point at the altitude of 62 mi (100 km) above the Earth's surface, setting a boundary between the atmosphere (airspace) and outer space (which is governed by space law).


Frontier

The frontier is a border that is open-ended to one side, identifying an expanding borderland to one side. This type of border can be fairly abstract and has been identified as a particular state of mind for human activity. As such frontiers have been applied to borderlands identifying and claiming them as terra nullius, such as Marie Byrd Land in West Antarctica, the only territory in Antarctica unclaimed by any sovereign nation.


Types of border regulation

In places where smuggling, migration, and infiltration are a problem, many countries fortify borders with fences and barriers, and institute formal border control procedures. These can extend inland, as in the United States where the U.S. Customs and Border Protection service has jurisdiction to operate up to 100 miles from any land or sea boundary. On the other hand, some borders are merely signposted. This is common in countries within the European Schengen Area and on rural sections of the Canada–United States border. Borders may even be completely unmarked, typically in remote or forested regions; such borders are often described as "porous". Migration within territorial borders, and outside of them, represented an old and established pattern of movement in African countries, in seeking work and food, and to maintain ties with kin who had moved across the previously porous borders of their homelands. When the colonial frontiers were drawn, Western countries attempted to obtain a monopoly on the recruitment of labor in many African countries, which altered the practical and institutional context in which the old migration patterns had been followed, and some might argue, are still followed today. The frontiers were particularly porous for the physical movement of migrants, and people living in borderlands easily maintained transnational cultural and social networks.


Regulated borders

Regulated borders have varying degrees of control on the movement of persons and trade between nations and
jurisdiction Jurisdiction (from Latin 'law' and 'speech' or 'declaration') is the legal term for the legal authority granted to a legal entity to enact justice. In federations like the United States, the concept of jurisdiction applies at multiple level ...
s. Most industrialized nations have regulations on entry and require one or more of the following procedures: visa check, passport check or
customs Customs is an authority or Government agency, agency in a country responsible for collecting tariffs and for controlling International trade, the flow of goods, including animals, transports, personal effects, and hazardous items, into and out ...
checks. Most regulated borders have regulations on immigration, types of wildlife and plants, and illegal objects such as drugs or weapons. Overall border regulations are placed by national and local governments and can vary depending on nation and current political or economic conditions. Some of the most regulated borders in the world include:
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
United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
,
Israel Israel, officially the State of Israel, is a country in West Asia. It Borders of Israel, shares borders with Lebanon to the north, Syria to the north-east, Jordan to the east, Egypt to the south-west, and the Mediterranean Sea to the west. Isr ...
,
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 ...
, 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 ...
, and the
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 ...
. These nations have government-controlled border agencies and organizations that enforce border regulation policies on and within their borders.


Open borders

An open border is the deregulation and or lack of regulation on the movement of persons between nations and jurisdictions. This definition does not apply to trade or movement between privately owned land areas. Most nations have open borders for travel within their nation of travel, though more authoritarian states may limit the freedom of internal movement of its citizens, as for example in the former USSR. However, only a handful of nations have deregulated open borders with other nations, an example of this being European countries under the Schengen Agreement or the open Belarus-Russia border. Open borders used to be very common amongst all nations, however this became less common after 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 ...
, which led to the regulation of open borders, making them less common and no longer feasible for most industrialized nations. An example of Open orders include the Schengen Area where 29 European nations mutually abolished their border control.


Demilitarized zones

A demilitarized zone (DMZ) is a border separating two or more nations, groups or militaries that have agreed to prohibit the use of military activity or force within the border's bounds. A DMZ can act as a war boundary, ceasefire line, wildlife preserve, or a ''de facto'' international border. An example of a demilitarized international border is the 38th parallel between North and South Korea. Other notable DMZ zones include
Antarctica Antarctica () is Earth's southernmost and least-populated continent. Situated almost entirely south of the Antarctic Circle and surrounded by the Southern Ocean (also known as the Antarctic Ocean), it contains the geographic South Pole. ...
and outer space (consisting of all space 100 miles away from the earth's surface), both are preserved for world research and exploration. The prohibition of control by nations can make a DMZ unexposed to human influence and thus developed into a natural border or wildlife preserve, such as on the Korean Demilitarized Zone, the Vietnamese Demilitarized Zone, and the Green Line in Cyprus.


Border economics

Borders undermine economic activity and development by reducing trade activity. The presence of borders often fosters certain economic features or anomalies. Wherever two jurisdictions come into contact, special economic opportunities arise for border trade. Smuggling provides a classic case; contrariwise, a border region may flourish on the provision of excise or of importexport services — legal or quasi-legal, corrupt or legitimate. Different regulations on either side of a border may encourage services to position themselves at or near that border: thus the provision of pornography, of prostitution, of alcohol, fireworks, and/or of narcotics may cluster around borders, city limits, county lines, ports and
airport An airport is an aerodrome with extended facilities, mostly for commercial Aviation, air transport. They usually consist of a landing area, which comprises an aerially accessible open space including at least one operationally active surf ...
s. In a more planned and official context, Special Economic Zones (SEZs) often tend to cluster near borders or ports. Even if the goods are not perceived to be undesirable, states will still seek to document and regulate the cross-border trade in order to collect tariffs and benefit from foreign currency exchange revenues. Thus, there is the concept unofficial trade in goods otherwise legal; for example, the cross-border trade in livestock by pastoralists in the Horn of Africa.
Ethiopia Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east, Ken ...
sells an estimated $250 to $300 million of livestock to
Somalia Somalia, officially the Federal Republic of Somalia, is the easternmost country in continental Africa. The country is located in the Horn of Africa and is bordered by Ethiopia to the west, Djibouti to the northwest, Kenya to the southwest, th ...
,
Kenya Kenya, officially the Republic of Kenya, is a country located in East Africa. With an estimated population of more than 52.4 million as of mid-2024, Kenya is the 27th-most-populous country in the world and the 7th most populous in Africa. ...
and Djibouti every year unofficially, over 100 times the official estimate. Human economic traffic across borders (apart from kidnapping) may involve mass commuting between workplaces and residential settlements. The removal of internal barriers to
commerce Commerce is the organized Complex system, system of activities, functions, procedures and institutions that directly or indirectly contribute to the smooth, unhindered large-scale exchange (distribution through Financial transaction, transactiona ...
, as in France after the French Revolution or in
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 ...
since the 1940s, de-emphasizes border-based economic activity and fosters free trade. Euroregions are similar official structures built around commuting across boundary.


Politics

Political borders have a variety of meanings for those whom they affect. Many borders in the world have checkpoints where border control agents inspect persons and/or goods crossing the boundary. Some borders require presentation of legal paperwork like passports and visas, or other identity documents, for persons to cross borders. To stay or work within a country's borders aliens (foreign persons) may need special
immigration Immigration is the international movement of people to a destination country of which they are not usual residents or where they do not possess nationality in order to settle as Permanent residency, permanent residents. Commuting, Commuter ...
documents or permits; but possession of such documents does not guarantee that the person should be allowed to cross the border. Moving goods across a border often requires the payment of excise tax, often collected by
customs Customs is an authority or Government agency, agency in a country responsible for collecting tariffs and for controlling International trade, the flow of goods, including animals, transports, personal effects, and hazardous items, into and out ...
officials. Animals (and occasionally humans) moving across borders may need to go into quarantine to prevent the spread of exotic infectious diseases. Most countries prohibit carrying illegal drugs or endangered animals across their borders. Moving goods, animals, or people illegally across a border, without declaring them or seeking permission, or deliberately evading official inspection, constitutes smuggling. Controls on car liability insurance validity and other formalities may also take place. A border may have been: * Agreed by the countries on both sides * Imposed by the country on one side * Imposed by third parties, e.g. an international conference * Inherited from a former state, colonial power or aristocratic territory * Inherited from a former internal border, such as within the former
Soviet Union The Union of Soviet Socialist Republics. (USSR), commonly known as the Soviet Union, was a List of former transcontinental countries#Since 1700, transcontinental country that spanned much of Eurasia from 1922 until Dissolution of the Soviet ...
* Never formally defined. In addition, a border may be a ''de facto'' military ceasefire line. In much of Europe, controls on persons were abolished by the 1985 Schengen Agreement and subsequent
European Union The European Union (EU) is a supranational union, supranational political union, political and economic union of Member state of the European Union, member states that are Geography of the European Union, located primarily in Europe. The u ...
legislation. Since the Treaty of Amsterdam, the competence to pass laws on crossing internal and external borders within the European Union and the associated Schengen Area states (
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 ...
,
Norway Norway, officially the Kingdom of Norway, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. The remote Arctic island of Jan Mayen and the archipelago of Svalbard also form part of the Kingdom of ...
,
Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...
, and
Liechtenstein Liechtenstein (, ; ; ), officially the Principality of Liechtenstein ( ), is a Landlocked country#Doubly landlocked, doubly landlocked Swiss Standard German, German-speaking microstate in the Central European Alps, between Austria in the east ...
) lies exclusively within the jurisdiction of the European Union, except where states have used a specific right to opt out (United Kingdom and
Ireland Ireland (, ; ; Ulster Scots dialect, Ulster-Scots: ) is an island in the North Atlantic Ocean, in Northwestern Europe. Geopolitically, the island is divided between the Republic of Ireland (officially Names of the Irish state, named Irelan ...
, which maintain the Common Travel Area amongst themselves). The United States has notably increased measures taken in border control on the Canada–United States border and the United States–Mexico border during its War on Terrorism (See Shantz 2010). One American writer has said that the US-Mexico border is probably "the world's longest boundary between a First World and Third World country". Historic borders such as the Great Wall of China, the Maginot Line, and
Hadrian's Wall Hadrian's Wall (, also known as the ''Roman Wall'', Picts' Wall, or ''Vallum Aelium'' in Latin) is a former defensive fortification of the Roman province of Roman Britain, Britannia, begun in AD 122 in the reign of the Emperor Hadrian. Ru ...
have played a great many roles and been marked in different ways. While the stone walls, the Great Wall 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 ...
and the Roman Hadrian's Wall in Britain had military functions, the entirety of the Roman borders were very porous, which encouraged Roman economic activity with neighbors. On the other hand, a border like the Maginot Line was entirely military and was meant to prevent any access in what was to be World War II to France by its neighbor, Germany; Germany ended up going around the Maginot Line through Belgium just as it had done in
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 ...
.


Border conflict

Border conflicts are disputes between territories that occur at the borders separating said territories. They occur when one party constructs identities or interests related to the border which are incompatible with the other party's identities and interests. Border conflicts or the potential of such are the reason why many borders feature fortifications and zoning like no man's lands, demilitarized zones, demarcation lines and buffer zones. Examples of border conflicts include skirmishes and wars, such as the 38th Parallel (between North and South Korea), Western Sahara conflict, and Kashmir region conflicts between India and Pakistan. A border conflict can occur due to several reasons. Most commonly, territorial disputes can result in border conflicts, as it is the case with the Kashmir conflict.


Border construction and crossings

While many borders are based on specific natural landscape features, some borders have additional man-made infrastructure. Fencing is used for security reasons, mainly to prevent unauthorised activity between the borders, including the travelling and transport of humans and goods. In a state of increased tension, borders may also be heavily fortified, with defensive infrastructure being built. Crossings may be built into a border to allow for regulated crossing into such territory.


Crossings and transition

Even the most fortified borders reserve specific places to allow crossing. The many forms of borders have different ways of enabling and controlling passage.


Movement and permeability

Borders can have a significant impact on and function for movement. It can enable and stop movement, across as well as along borders. The permeability of borders depends on its construction, availability of crossings, regulation and types or scope of activity. The permeability can vary, borders can be barriers for humans, but also for animal migration or types of pollution.


Overlap and cooperation

Borders facilitate or block hybrids like border overlap and cooperation beyond mere encounter and exchange.


Cross-border regions

Macro-regional integration initiatives, such as the European Union and NAFTA, have spurred the establishment of cross-border regions. These are initiatives driven by local or regional authorities, aimed at dealing with local border-transcending problems such as transport and environmental degradation. Many cross-border regions are also active in encouraging intercultural communication and dialogue as well as cross-border economic development strategies.
In
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 ...
, the
European Union The European Union (EU) is a supranational union, supranational political union, political and economic union of Member state of the European Union, member states that are Geography of the European Union, located primarily in Europe. The u ...
provides financial support to cross-border regions via its Interreg programme. The Council 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 ...
has issued the Outline Convention on Transfrontier Co-operation, providing a legal framework for cross-border co-operation even though it is in practice rarely used by Euroregions.


Border studies

There has been a renaissance in the study of borders starting with the end of the 1990s, partially from the creation of a counter-narrative to the discourse about the world becoming a borderless and deterritorialized place, which has accompanied theories about globalization. Examples of recent initiatives are the Border Regions in Transition network of scholars, the International Boundaries Research Unit at the University of Durham, the Association for Borderlands Studies based in
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
, the African Borderlands Research Network and the founding of smaller border research centres at Nijmegen and Queen's University Belfast.


Border art

Border art is a
contemporary art Contemporary art is a term used to describe the art of today, generally referring to art produced from the 1970s onwards. Contemporary artists work in a globally influenced, culturally diverse, and technologically advancing world. Their art is a ...
practice rooted in the socio-political experience(s), such as of those on the U.S.-Mexico borderlands, or ''frontera''. Since its conception in the mid-1980s, this artistic practice has assisted in the development of questions surrounding homeland, borders, surveillance, identity, race,
ethnicity An ethnicity or ethnic group is a group of people with shared attributes, which they Collective consciousness, collectively believe to have, and long-term endogamy. Ethnicities share attributes like language, culture, common sets of ancestry, ...
, and national origin(s). Border art as a conceptual artistic practice, however, opens up the possibility for artists to explore similar concerns of identity and national origin(s) but whose location is not specific to the U.S-Mexico border. A border can be a division, dividing groups of people and families. Borders can include but are not limited to language, culture, social and economic class, religion, and national identity. In addition to a division, a border can also conceive a borderland area that can create a cohesive community separate from the mainstream cultures and identities portrayed in the communities away from the borders, such as the Tijuana-San Diego border between Mexico and the United States. Border art can be defined as an art that is created in reference to any number of physical or imagined boundaries. This art can but is not limited to social, political, physical,
emotion Emotions are physical and mental states brought on by neurophysiology, neurophysiological changes, variously associated with thoughts, feelings, behavior, behavioral responses, and a degree of pleasure or suffering, displeasure. There is ...
al and/or nationalist issues. Border art is not confined to one particular medium. Border art/artists often address the forced politicization of human bodies and physical land and the arbitrary, yet incredibly harmful, separations that are created by these borders and boundaries. These artists are often "border crossers" themselves. They may cross borders of traditional art-making (through performance, video, or a combination of mediums). They may at once be artists and activists, existing in multiple social roles at once. Many border artists defy easy classifications in their artistic practice and work.


See also

* Border barrier * Border control * Border irregularities of the United States * Boundaries between the continents of Earth * Boundary delimitation * Enclave and exclave * Illegal entry * List of border conflicts * List of bordering countries with greatest relative differences in GDP (PPP) per capita * List of countries and territories by land borders * List of countries by land and maritime borders * List of countries that border only one other country * List of divided islands * List of international river borders * List of land borders with dates of establishment * List of national border changes from 1815 to 1914 * List of national border changes (1914–present) * List of territorial disputes * Maritime boundary * Natural frontiers * Quadripoint *
Tripoint A triple border, tripoint, trijunction, triple point, or tri-border area is a geography, geographical point at which the boundaries of three countries or Administrative division, subnational entities meet. There are 175 international tripoints ...


References


Further reading

* *
The World in 2015: National borders undermined?
11-min video interview with Bernard Guetta, a columnist for Libération newspaper and France Inter radio. "For uetta one of the main lessons from international relations in 2014 is that national borders are becoming increasingly irrelevant. These borders, drawn by the colonial powers, were and still are entirely artificial. Now, people want borders along national, religious or ethnic lines. Bernard Guetta calls this a "comeback of real history"." * Baramova, Maria (2010)
''Border Theories in Early Modern Europe''EGO - European History Online
Mainz
Institute of European History
retrieved: March 25, 2021
pdf
. * * * Said Saddiki,

'. Cambridge, UK: Open Book Publishers, 2017
World of Walls: The Structure, Roles and Effectiveness of Separation Barriers
* Struck, Bernhard
''Border Regions''EGO – European History Online
Mainz
Institute of European History
2013, retrieved: March 8, 2021
pdf
.


External links



* [https://web.archive.org/web/20080222234042/http://www.culture-routes.lu/php/fo_index.php?lng=en&back=%2Fphp%2Ffo_index.php%3Flng%3Den%26dest%3Dbd_ac_lst&dest=bd_ac_det&id=00002600 Institut Européen des Itinéraires Culturels homepage]
Border Ireland – database of activities and publications on cross-border co-operation on the island of Ireland since 1980's

Baltic Borderlands Greifswald
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