Borders are geographic
boundaries of political entities
or legal jurisdiction
s, such as government
s, sovereign states
, federated states
, and other subnational entities
. Borders are established through agreements between political or social entities that control those areas; the creation of these agreements is called boundary delimitation
Some borders—such as most state's internal administrative border, or inter-state borders within the Schengen Area
and completely unguarded. Most external borders are partially or fully controlled, and may be crossed legally only at designated border checkpoint
s and border zone
s may be controlled.
Borders may even foster the setting up of buffer zone
s. A difference has also been established in academic scholarship between border and frontier
, the latter denoting a state of mind rather than state boundaries.
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 outlaw
s, there the outlaws 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–Kuwaiti neutral zone
from 1922 until 1970. In modern times, marchlands have been replaced by clearly defined and demarcated borders. For the purposes of border control
s and seaport
s 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.
Some borders require presentation of legal paperwork like passport
s and visa
s, or other identity document
s, for persons to cross borders. To stay or work within a country's borders aliens
(foreign persons) may need special immigration
documents or permit
s; 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
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.
In places where smuggling, migration, and infiltration are a problem, many countries fortify borders with fences and barrier
s, 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.
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
* Never formally defined.
In addition, a border may be a ''de facto'' military ceasefire line.
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.
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:
s: oceans create very costly natural borders. Very few countries span more than one continent
. Only very large and resource-rich states are able to sustain the costs of governance across oceans for longer periods of time.
s: some political borders have been formalized along natural borders formed by rivers. Some examples are: the Niagara River
(Canada–USA), the Rio Grande
(Mexico–USA), the Rhine
(France–Germany), and the Mekong
(Thailand–Laos). If a precise line is desired, it is often drawn along the thalweg
, the deepest line along the river. In the Hebrew Bible
defined the middle of the river Arnon
as the border between Moab
and the Israelite
tribes settling east of the Jordan
(). The United States Supreme Court
ruled in 1910 that the boundary between the American states of Maryland and West Virginia
is the south bank of the Potomac River
s: larger lakes create natural borders. One example is the natural border created by Lake Tanganyika
, with the Democratic Republic of the Congo
on its west shore and Tanzania
on the east.
s: denser jungles or forests can create strong natural borders. One example of a natural forest border is the Amazon rainforest
, separating Brazil
* Mountain range
s: research on borders suggests that mountains have especially strong effects as natural borders. Many nations in Europe and Asia have had 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.
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 labor and financial investment.
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
and the Middle East
. The Canada–United States border
from Lake of the Woods Ontario
to the Pacific Ocean
follows the 49th parallel for roughly .
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
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.
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
and West Germany
is no longer an international boundary, but it can still be seen because of historical markers on the landscape, and it is still a cultural and economic division in Germany
. Other examples include the Demilitarized Zone
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
and Italian Somaliland
ceased to exist when the two colonies merged to form the independent state of Somalia
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
. Similar to a cease-fire line, an LoC is typically the result of war, military stalemates and unresolved land ownership conflict.
A maritime border is a division enclosing an area in the ocean where a nation has exclusive rights over the mineral and biological resources,
[VLIZ Maritime Boundaries Geodatabase]
retrieved 19 November 2010
encompassing maritime features, limits and zones.
retrieved 19 November 2010
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 zone
s, and exclusive economic zone
s; however, the terminology does not encompass lake
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.
is the atmosphere
located within a countries 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
With international agreement a country can assume the responsibility of protecting or controlling the atmosphere over International Airspaces such as the Pacific Ocean
. 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 earths surface, setting a boundary between the earths atmosphere and outer space
governed by space law
. Airspace regulations are set by nations and local governments within an airspace, regulations of airspace differ by country and location.
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
Types of border regulation
An open border
is the deregulation and or lack of regulation on the movement of persons between nations and jurisdictions, this 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
, which lead to the regulation of open borders, making them less common and no longer feasible for most industrialized nations
Regulated Borders have varying degrees of control on the movement of persons and trade between nations and jurisdictions
. Most Industrialized
nations have regulations on entry and require one or more of the following procedures: visa
check or customs
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
, the United States
, the United Kingdom
, and the United Arab Emirates
. These nations have government controlled border agencies and organizations that enforce border regulation policies on and within their borders.
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
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
The presence of borders often fosters certain economic features or anomalies. Wherever two jurisdictions come into contact, special economic opportunities arise for border trade
provides a classic case; contrariwise, a border region may flourish on the provision of excise
or of import
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
, and/or of narcotics
may cluster around borders, city limits, county lines, port
s and airport
s. In a more planned and official context, Special Economic Zone
s (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.
[Pavanello, Sara 2010]
Working across borders – Harnessing the potential of cross-border activities to improve livelihood security in the Horn of Africa drylands
. London: Overseas Development Institute
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
sells an estimated $250 to $300 million of livestock to Somalia
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
, as in France after the French Revolution
or in Europe
since the 1940s, de-emphasizes border-based economic activity and fosters free trade
s are similar official structures built around commuting across boundary.
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.
In much of Europe, controls on persons were abolished by the 1985 Schengen Agreement
and subsequent European Union
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
, and Liechtenstein
) lies exclusively within the jurisdiction of the European Union, except where states have used a specific right to opt out (United Kingdom and Ireland
, which maintain the Common Travel Area
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
Historic borders such as the Great Wall of China
, the Maginot Line
, and Hadrian's Wall
have played a great many roles and been marked in different ways. While the stone wall
s, the Great Wall of China
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
Border conflicts or the potential of such are the reason why many borders feature fortification
s and zoning like no man's land
s, demilitarized zone
s, demarcation line
s and buffer zone
Today's international borders are shaped and regulated by international agreement
s, cooperation and institutions like the United Nations
facilitating this internationalism
. One example of recurring negotiations of borders are water borders
Border construction and crossings
Borders have sometimes been significantly shaped by physical border constructions and openings. From border crossings, over border markers
to border barrier
s these constructions fulfill many different functions. Such as also providing crossover.
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 an significant impact on and function for movement. It can enable and stop movement, across as well as along borders.
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.
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.
, the European Union
provides financial support to cross-border regions via its Interreg
programme. The Council of Europe
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.
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
, the African Borderlands Research NetworkABORNE
and the founding of smaller border research centres at Nijmegen
and Queen's University Belfast
.Centre for International Borders Research (CIBR)
Queen's University Belfast
* Border art is a contemporary art 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-80's, this artistic practice has assisted in the development of questions surrounding homeland, borders, surveillance, identity, race, ethnicity, 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-México 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, emotional 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.
The following pictures show in how many different ways international and regional borders can be closed off, monitored, at least marked as such, or simply unremarkable.
File:International border at Wagah - evening flag lowering ceremony.jpg|The Wagah border crossing between India and Pakistan along the Radcliffe Line.
File:Tijuana-san diego border deaths.jpg|Border at Tijuana, Mexico and San Ysidro, California, United States with memorial coffins for those killed crossing this border. A straight-line border surveyed when the region was thinly populated.
File:Lo Wu Restricted Area Sign.JPG|A sign showing the limits of the Frontier Closed Area, a 28-km² area along the Hong Kong-side of the 30-km-long border between Hong Kong and mainland China.
File:Karigasniemi Finland Bridge over Inarijoki.jpg|The bridge over the Anarjohka in Karigasniemi, on the border of Finland with Norway
File:Argentina-Brazil border.jpg|The border between Argentina (Puerto Iguazú) and Brazil (Foz do Iguazú) on the Iguazú River. Paraguay (Ciudad del Este) is in the background.
File:Peace Arch, U.S.-Canada border.jpg|The Peace Arch at the Canada–United States border, the longest common border in the world.
File:Grenzüberschreitender Wanderweg.jpg|A sign at the Polish-Czech border near Králický Sněžník, indicating that only citizens of the European Union and of five more states may cross. When the Schengen rules became applicable in 2007, the sign became obsolete.
File:OffeneGrenzeNiederndorf-Oberaudorf.jpg|A typical Schengen internal border (near Kufstein between Germany and Austria): the traffic island marks the spot where a control post once stood; it was removed in 2000.
File:Border flower pot.jpg|Self-illuminating Border flower pot between Burghausen, Salzach in Germany and Ach in Austria.
File:GrenzeVaalsMitteRoteLinie.JPG|A border within a closely built-up area – near Aachen between Germany and the Netherlands: Germany starts at the red line drawn in the photo.
File:Baarle-Nassau frontière café.jpg|Border between the Netherlands and Belgium next to a street café in Baarle Nassau and Baarle Hertog. Some European borders originate from former land ownership boundaries.
File:EBC-Grenze.JPG|The metal strip within the building of the ''Eurode Business Centre'' marks the border between the Netherlands and Germany, in Kerkrade and Herzogenrath.
File:Neustrasse, Herzogenrath.jpg|The border between the Netherlands (right) and Germany (left) is located in the center of this residential road, and, nowadays, completely unmarked.
File:Border stone.JPG|Italy/Switzerland border stone at Passo San Giacomo. Some borders were broadly defined by treaty, and surveyors would then choose a suitable line on the ground.
File:Puente sobre el Guadiana.JPG|Guadiana International Bridge at the Portugal-Spain border, whose limits were established by the Treaty of Alcañices in 1297. It is one of the oldest borders in the world.
File:Treriks.jpg|The Treriksröset cairn located at the point where Sweden, Norway and Finland meet.
File:Indonesia-Timor Leste border.jpg|The gate that borders East Nusa Tenggara in Indonesia and East Timor.
File:USCanadaBorderByPhilKonstantin.jpg|The marker between the United States and Canada in Waterton-Glacier National Park.
File:The Border on Killeen School Road - geograph.org.uk - 446719.jpg|A road crossing the Republic of Ireland-United Kingdom border from the British side. This border is entirely open: the only indication that one is crossing into the Republic of Ireland is a speed limit sign in kilometers per hour (signs in the United Kingdom are in miles per hour).
File:China - Russia Railway.jpg|A train crossing the China–Russia border, travelling from Zabaykalsk in Russia to Manzhouli in China.
File:India-Pakistan Border at Night.jpg|The winding border between Pakistan and India is lit by security lights. It is one of the few places on Earth where an international boundary can be seen at night.
File:Hadrian's wall at Greenhead Lough.jpg|A section of Hadrian's Wall marking the border of Roman Britain
*Illegal border crossing
*Boundary (real estate)
*Limes (Roman Empire)
*List of countries and territories by land and maritime borders
*List of countries that border only one other country
*List of international border rivers
*List of countries and territories by land borders
*List of bordering countries with greatest relative differences in GDP (PPP) per capita
*List of land borders with dates of establishment
*List of national border changes since World War I
Border Stories – A website devoted to stories from both sides of the U.S. Mexico Border
online audio archive at Queen's University Belfast
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
Institute of European History
retrieved: March 25, 2021
'. Cambridge, UK: Open Book Publishers, 2017. https://doi.org/10.11647/OBP.0121
* Struck, Bernhard
EGO - European History Online
Institute of European History
2013, retrieved: March 8, 2021
*[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
Gallery of 1100 borderpoints in the world
Baltic Borderlands Greifswald