# Enclave and exclave

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Explanatory diagram of territorial discontinuities: Enclaves and exclaves
Different territories (countries, states, counties, municipalities, etc.) are represented by different colours and letters; separated parts of the same territory are represented by the same colour and letter, with a different number added to each smaller part of that territory (the main part is identified by the letter only).
•   A:
• possesses 5 exclaves (A1, A2, A3, A4, and A5): it is impossible to go from the main part of A to any of these parts going only through territory of A; however:
• A1 and A2 are not enclaves: neither of them is surrounded by a single "foreign" territory;
• A1 is a semi-enclave and a semi-exclave: it has an unsurrounded sea border;
• A2 is an exclave of A: it is separated from A;
• A3 is an enclave: it is totally surrounded by B;
• A4 and A5 are counter-enclaves (also known as second-order enclaves): territories belonging to A that are encroached inside the enclave E;
• contains 1 enclave (E): "foreign" territory totally surrounded by territory of A;
• contains 1 counter-counter-enclave, or third-order enclave (E1).
•   B:
• contains 2 enclaves (A3 and D).
•   C:
• continuous territory, contains no enclave or exclave
•   D:
• is an enclaved territory: it is territorially continuous, but its territory is totally surrounded by a single "foreign" territory (B).
•   E:
• is an enclaved territory: it is inside A;
• contains 2 enclaves (A4 and A5), which are counter-enclaves of A;
• possesses 1 counter-enclave (E1), which is a counter-counter-enclave as viewed by A and contained within A5.
In topological terms, A and E are each (sets of) unconnected surfaces, and B, C and D are connected surfaces. However, C and D are also simply connected surfaces, while B is not (it has first Betti number 2, the number of "holes" in B).

An enclave is a territory that is entirely surrounded by the territory of only one other state or entity. An enclave can be an independent territory or part of a larger one.[1] Enclaves may also exist within territorial waters.[2]: 60  Enclave is sometimes used improperly to denote a territory that is only partly surrounded by another state.[1] Enclaves that are not part of a larger territory are not exclaves, for example Vatican City and San Marino (both enclaved by Italy) and Lesotho (enclaved by South Africa) are enclaved sovereign states.

An exclave is a portion of a state or district geographically separated from the main part, by some surrounding alien territory.[3] Many exclaves are also enclaves, but not all: an exclave surrounded by the territory of more than one state is not an enclave.[4] The Azerbaijani exclave of Nakhchivan is an example of an exclave that is not an enclave, as it borders Armenia, Turkey and Iran.

Semi-enclaves and semi-exclaves are areas that, except for possessing an unsurrounded sea border (a coastline contiguous with international waters), would otherwise be enclaves or exclaves.[4]: 116 [5]: 12–14  Semi-enclaves and enclaves are mutually exclusive. Likewise, semi-exclaves and exclaves are mutually exclusive. Enclaves and semi-enclaves can exist as independent states (Monaco, The Gambia and Brunei are semi-enclaves), while exclaves and semi-exclaves proper always constitute just a part of a sovereign state (like the Kaliningrad Oblast).[4]

A pene-exclave is a part of the territory of one country that can be conveniently approached – in particular, by wheeled traffic – only through the territory of another country.[6]: 283  Pene-exclaves are also called functional exclaves or practical exclaves.[5]: 31  Many pene-exclaves partially border their own territorial waters (i.e., they are not surrounded by other nations' territorial waters), such as Point Roberts, Washington, and Minnesota's Northwest Angle. A pene-exclave can also exist entirely on land, such as when intervening mountains render a territory inaccessible from other parts of a country except through alien territory. A commonly cited example is the Kleinwalsertal, a valley part of Vorarlberg, Austria, that is accessible only from Germany to the north.

## Origin and usage

The word enclave is French and first appeared in the mid-15th century as a derivative of the verb enclaver (1283), from the colloquial Latin inclavare (to close with a key).[7] Originally, it was a term of property law that denoted the situation of a land or parcel of land surrounded by land owned by a different owner, and that could not be reached for its exploitation in a practical and sufficient manner without crossing the surrounding land.[7] In law, this created a servitude[8] of passage for the benefit of the owner of the surrounded land. The first diplomatic document to contain the word enclave was the Treaty of Madrid, signed in 1526.[2]: 61

Later, the term enclave began to be used also to refer to parcels of countries, counties, fiefs, communes, towns, parishes, etc. that were surrounded by alien territory. This French word eventually entered English and other languages to denote the same concept, although local terms have continued to be used. In India, the word "pocket" is often used as a synonym for enclave (such as "the pockets of Puducherry district").[9] In British administrative history, subnational enclaves were usually called detachments or detached parts, and national enclaves as detached districts or detached dominions.[10] In British ecclesiastic history, subnational enclaves were known as peculiars (see also royal peculiar).

The word exclave[3] is a logically extended back-formation of enclave.

## Characteristics

Enclaves exist for a variety of historical, political and geographical reasons. For example, in the feudal system in Europe, the ownership of feudal domains was often transferred or partitioned, either through purchase and sale or through inheritance, and often such domains were or came to be surrounded by other domains. In particular, this state of affairs persisted into the 19th century in the Holy Roman Empire, and these domains (principalities, etc.) exhibited many of the characteristics of sovereign states. Prior to 1866 Prussia alone consisted of more than 270 discontiguous pieces of territory.[2]: 61

Residing in an enclave within another country has often involved difficulties in such areas as passage rights, importing goods, currency, provision of utilities and health services, and host nation cooperation. Thus, over time, enclaves have tended to be eliminated. For example, two-thirds of the then-existing national-level enclaves were extinguished on 1 August 2015, when the governments of India and Bangladesh implemented a Land Boundary Agreement that exchanged 162 first-order enclaves (111 Indian and 51 Bangladeshi). This exchange thus effectively removed another two dozen second-order enclaves and one third-order enclave, eliminating 197 of the India–Bangladesh enclaves in all. The residents in these enclaves had complained of being effectively stateless. Only Bangladesh's Dahagram–Angarpota enclave remained.

Netherlands and Belgium decided to keep the enclave and exclave system in Baarle. As both Netherlands and Belgium are members of the European Union and Schengen Area, people, goods and services flow freely with little or no restrictions.

## Enclave versus exclave

For illustration, in the figure (above), A1 is a semi-enclave (attached to C and also bounded by water that only touches C's territorial water). Although A2 is an exclave of A, it cannot be classed as an enclave because it shares borders with B and C. The territory A3 is both an exclave of A and an enclave from the viewpoint of B. The singular territory D, although an enclave, is not an exclave.

## True enclaves

An enclave is a part of the territory of a state that is enclosed within the territory of another state. To distinguish the parts of a state entirely enclosed in a single other state, they are called true enclaves.[5]: 10  A true enclave cannot be reached without passing through the territory of a single other state that surrounds it. In 2007, Evgeny Vinokurov called this the restrictive definition of "enclave" given by international law, which thus "comprises only so-called 'true enclaves'".[5]: 10  Two examples are Büsingen am Hochrhein, a true enclave of Germany, and Campione d'Italia, a true enclave of Italy, both of which are surrounded by Switzerland.

The definition of a territory comprises both land territory and territorial waters. In the case of enclaves in territorial waters, they are called maritime (those surrounded by territorial sea) or lacustrine (if in a lake) enclaves.[5]: 10  Most of the true national-level enclaves now existing are in Asia and Europe. While subnational enclaves are numerous the world over, there are only a few national-level true enclaves in Africa, Australia and the Americas (each such enclave being surrounded by the territorial waters of another country).

A historical example is West Berlin before the reunification of Germany. Since 1945, all of Berlin had been ruled de jure by the four Allied powers. However, the East German government and the Soviet Union treated East Berlin as an integral part of East Germany, so West Berlin was a de facto enclave within East Germany. Also, 12 small West Berlin enclaves, such as Steinstücken, were separated from the city, some by only a few meters.[11]

## Enclaved countries

Three countries qualify as completely surrounded by another country's land and/or internal waters:

Historically, four Bantustans (or "Black homelands") of South Africa were granted nominal independence, unrecognized internationally, by the Apartheid government from 1976 until their reabsorption in 1994. Others remained under government rule from 1948 to 1994. Being heavily partitioned, various parts of these Bantustans were true enclaves.

The United States' constitutional principle of tribal sovereignty treats federally recognized Indian reservations as quasi-independent enclaves.

## True exclaves

True exclave is an extension of the concept of true enclave. In order to access a true exclave from the mainland, a traveller must go through the territory of at least one other state. Examples include:

Enclave Exclave Semi-enclave Semi-exclave Both enclave and exclave Enclave but not exclave Exclave but not enclave Both semi-enclave and semi-exclave Semi-enclave but not semi-exclave Semi-exclave but not semi-enclave 1[b] ≥1 1 ≥1 1 1 >1 1 1 >1 Maybe Yes Maybe Yes Yes No Yes Yes No Yes No No Yes Yes No No No Yes Yes Yes

### Semi-enclaves and semi-exclaves

Semi-enclaves and semi-exclaves are areas that, except for possessing an unsurrounded sea border, would otherwise be enclaves or exclaves.[4]: 116 [5]: 12–14  Semi-enclaves can exist as independent states that border only one other state, such as Monaco, the Gambia and Brunei. Vinokurov (2007) declares, "Technically, Portugal, Denmark, and Canada also border only one foreign state, but they are not enclosed in the geographical, political, or economic sense. They have vast access to international waters. At the same time, there are states that, although in possession of sea access, are still enclosed by the territories of a foreign state."[5]: 14  Therefore, a quantitative principle applies: the land boundary must be longer than the coastline. Thus a state is classified as a sovereign semi-enclave if it borders on just one state, and its land boundary is longer than its sea coastline.[5]: 14, 20–22

(Since Vinokurov's writing in 2007, Canada and Denmark have each gained a second bordering state — each other — with the 2022 division of Hans Island.)

Vinokurov affirms that "no similar quantitative criterion is needed to define the scope of non-sovereign semi-enclaves/exclaves."[5]: 14, 26 [15] Examples include:

### Subnational enclaves and exclaves

Sometimes, administrative divisions of a country, for historical or practical reasons, caused some areas to belong to one division while being attached to another. Examples include:

### "Practical" enclaves, exclaves and inaccessible districts

The term pene-exclave was defined in Robinson (1959) as "parts of the territory of one country that can be approached conveniently – in particular by wheeled traffic – only through the territory of another country."[6]: 283  Thus, a pene-exclave, although having land borders, is not completely surrounded by the other's land or territorial waters.[17]: 60  Catudal (1974)[18]: 113  and Vinokurov (2007)[5]: 31–33  further elaborate upon examples, including Point Roberts. "Although physical connections by water with Point Roberts are entirely within the sovereignty of the United States, land access is only possible through Canada."[18]

Pene-enclaves are also called functional enclaves or practical enclaves.[5]: 31  They can exhibit continuity of state territory across territorial waters but, nevertheless, a discontinuity on land, such as in the case of Point Roberts.[5]: 47  Along rivers that change course, pene-enclaves can be observed as complexes comprising many small pene-enclaves.[5]: 50  A pene-enclave can also exist entirely on land, such as when intervening mountains render a territory, although geographically attached, inaccessible from other parts of a country except through alien territory. A commonly cited example is the Kleinwalsertal, a valley part of Vorarlberg, Austria, that is only accessible from Germany to the north, being separated from the rest of Austria by high mountains traversed by no roads. Another example is the Spanish village of Os de Civís, accessible from Andorra.

Hence, such areas are enclaves or exclaves for practical purposes, without meeting the strict definition. Many pene-exclaves partially border the sea or another body of water, which comprises their own territorial waters (i.e., they are not surrounded by other nations' territorial waters). They border their own territorial waters in addition to a land border with another country, and hence they are not true exclaves. Still, one cannot travel to them on land without going through another country. Attribution of a pene-enclave status to a territory can sometimes be disputed, depending on whether the territory is considered to be practically inaccessible from the mainland or not.[5]: 33

### Enclaves within enclaves

It is possible for an enclave of one country to be completely surrounded by a part of another country that is itself an enclave of the first country. These enclaves are sometimes called counter-enclaves or second-order enclaves. Two such complexes containing them exist currently:

The former complex of enclaves at Cooch Behar district included 24 second-order enclaves and one small third-order enclave called Dahala Khagrabari #51: a piece of India within a part of Bangladesh, within a part of India, within Bangladesh. The India–Bangladesh enclaves were exchanged on 31 July 2015 by the ratified Land Boundary Agreement, and Dahala Khagrabari was ceded to Bangladesh.

The border arrangements concerning the Vennbahn meant that, from 1922 to 1949, a Belgian counter-enclave existed within a German enclave.

### Ethnic enclaves

An ethnic enclave is a community of an ethnic group inside an area in which another ethnic group predominates. Ghettos, Little Italys, barrios and Chinatowns are examples. These areas may have a separate language, culture and economic system. Examples of larger ethnic enclaves include Székely Land in Romania, several Serb enclaves in Kosovo or the former Nagorno-Karabakh in Azerbaijan. These entities often manifest certain levels of autonomy or independence initiatives, which may lead to conflict with surrounding ethnic groups.

### Extraterritoriality

Diplomatic missions, such as embassies and consulates, as well as military bases, are usually exempted from the jurisdiction of the host country, i.e., the laws of the host nation in which an embassy is located do not typically apply to the land of the embassy or base itself. This exemption from the jurisdiction of the host country is defined as extraterritoriality. Areas and buildings enjoying some forms of extraterritoriality are not true enclaves since, in all cases, the host country retains full sovereignty. In addition to embassies, some other areas enjoy a limited form of extraterritoriality.

Examples of this include:

### Land owned by a foreign country

One or more parcels/holdings of land in most countries is owned by other countries. Most instances are exempt from taxes. In the special case of embassies/consulates these enjoy special privileges driven by international consensus particularly the mutual wish to ensure free diplomatic missions, such as being exempt from major hindrances and host-country arrests in ordinary times on the premises. Most non-embassy lands in such ownership are also not enclaves as they fall legally short of extraterritoriality, they are subject to alike court jurisdiction as before their grant/sale in most matters. Nonetheless, for a person's offence against the property itself, equally valid jurisdiction in criminal matters is more likely than elsewhere, assuming the perpetrator is found in the prosecuting authority's homeland. Devoid of permanent residents, formally defined new sovereignty is not warranted or asserted in the examples below. Nonetheless, minor laws, especially on flag flying, are sometimes relaxed to accommodate the needs of the accommodated nation's monument.

Embassies enjoy many different legal statuses approaching quasi-sovereignty, depending on the agreements reached and in practice upheld from time-to-time by host nations. Subject to hosts adhering to basic due process of international law, including giving warnings, the enforced reduction of scope of a foreign embassy has always been a possibility, even to the point of expelling the foreign embassy entirely, usually on a breakdown of relations, in reaction to extreme actions such as espionage, or as another form of sanction. The same seems to be possible in profit-driven moving or drilling under any of the sites below, providing safeguards as the structure or a new replacement site. The same possible curtailments and alterations never apply to proper exclaves.

Examples of such land other than for diplomatic missions are:

• Napoleon's original grave in Longwood, Saint Helena, owned by France.[34]
• Victor Hugo's house in Saint Peter Port (Saint-Pierre-Port), Guernsey, owned by the city of Paris.[35]
• The Brest memorial in Brest, France, is owned by the U.S. It commemorates World War I.
• The Normandy American Cemetery and Memorial in Normandy, France, which contains the graves of 9,386 American military dead, most of whom died during the landings and ensuing operations of World War II, owned by the United States.[36]
• Pointe du Hoc, the 13-hectare site of a memorial and museum dedicated to the World War II Normandy landing at Omaha Beach, France, transferred to the U.S. on 11 January 1979.[37]
• The Suvorov memorial [de] to Russia's final Generalissimo Alexander Suvorov near Göschenen in central Switzerland, was erected 99 years after his death by the Russian Empire.[38]
• The Vimy Memorial in France, which commemorates the Battle of Vimy Ridge. The French government permanently granted the about 91 ha (220 acres) to Canada as a war memorial in 1922 in recognition of Canada's military contributions in World War I in general and at Vimy Ridge in particular.[39]
• Two cemeteries on the Outer Banks of North Carolina, United States: one on Ocracoke Island and one on Hatteras Island in the town of Buxton, are owned by the United Kingdom hosting the British seamen washed ashore after World War II U-boat attacks of 10 April (one from the San Delfino) and 11 May 1942 (five from HMT Bedfordshire).[40] Four graves are at Ocracoke and two at Buxton; three of the bodies were never identified; one of them could be that of a Canadian seaman.[41] The plot of land at Ocracoke "has been forever ceded to England" and is maintained by the U.S. Coast Guard.[42] The plot was leased to the Commonwealth War Graves Commission for as long as the land remained a cemetery.[41] The graves on Hatteras Island are maintained by the U.S. National Park Service.[43]
• The Captain Cook Monument at Kealakekua Bay and about 25 square feet (2.3 m2) of land around it in Hawaii, United States, the place where James Cook was killed in 1779, is owned by the United Kingdom.[44][45][46][47] An historian on the occasion of the monument's 50th anniversary recorded in 1928 that the white stone "obelisk monument [was] erected to the memory of Captain Cook, about 1876, and on land deeded outright to the British Government by Princess Likelike, sister of King Kalakaua, about the same year, so that that square is absolute British Territory."[48] Hawaii was a sovereign nation at the time. According to MacFarlane, "The land under the monument was deeded to the United Kingdom in 1877 and is considered as sovereign non-embassy land owned by the British Embassy in Washington DC. ... the Hawaiian State Parks agency maintained that as sovereign British territory it was the responsibility of the UK to maintain the site."[49]
• Tiwinza in Peru: In the 1998 peace agreement following the 1995 Cenepa War, Peru ceded to Ecuador the property, but not the sovereignty, of one square kilometre within Tiwinza (where 14 Ecuadorian soldiers were buried). Ecuador had established a frontier military outpost in Tiwinza, an area that was specified in the agreement as belonging to Peru.[50][51]

## Unusual cross-border transport channels

### National railway passing through another state's territory

Changes in borders can make a railway that was previously located solely within a country traverse the new borders. Since diverting a railway is expensive, this arrangement may last a long time. This may mean that doors on passenger trains are locked and guarded to prevent illicit entry and exit while the train is temporarily in another country. Borders can also be in the "wrong" place, forcing railways into difficult terrain. In large parts of Europe, where the Schengen Area has eliminated border controls when travelling between its 27 member countries, this problem no longer exists, and railways can criss-cross borders with no need for border controls or locked trains.[56]

Examples include:

#### Europe

##### Historical
• During the Cold War, underground lines in West Berlin ran under parts of East Berlin. Ghost stations (German: Geisterbahnhöfe) were stations on Berlin's U-Bahn and S-Bahn metro networks that were closed during this period of Berlin's division.
• In Finland, Porkkala was leased to the Soviet Union as a Soviet naval base between 1944 and 1956. Porkkala is located on the Rantarata, the main railway line between Helsinki and Turku. Initially, only Soviet traffic was permitted through, forcing Finnish State Railways to reroute the trains through a circuitous route via Toijala. However, in 1947, the Soviets agreed to let Finnish trains through. At the border, Finnish trains were shunted to a Soviet locomotive, windows were shuttered, guards were posted to the doors, and the Soviet locomotive would pull the train through the base area, to be shunted back to a Finnish locomotive at the opposite border.

### Highway of one state passing through another state's territory

This arrangement is less common as highways are more easily re-aligned. Some examples are:

#### Asia

• The road from Dubai to the tourist spot of Hatta, an exclave of the emirate of Dubai, passes through a small stretch of Omani territory.
• The highway between Bishkek and Issyk Kul, both in Kyrgyzstan, skirts the border with Kazakhstan, with the highway and the border crossing each other for short distances at various points.

#### Europe

• Various roads cross the Republic of Ireland–United Kingdom border, back and forth between the Republic of Ireland and Northern Ireland. The N54 in County Monaghan (RoI) twice becomes the A3 in County Fermanagh (NI), before continuing as the N54. Similarly, the N53 in Monaghan passes through County Armagh (NI) as the A37, before resuming as the N53 at a point where County Armagh, County Monaghan and County Louth (RoI) all meet.[65] As of July 2019, no national or border signs are present: the only indication is the change in margin markings and signs to indicate a change in speed limits between mph and km/h.[66] It remains to be seen whether Brexit will change this friendly arrangement, which has persisted since the Good Friday Agreement of 1998.[67]
• Between 1963 and 2002 the N274 road from Roermond to Heerlen, part of Dutch territory, passed through the German Selfkant, which had been annexed by the Netherlands after the Second World War but returned to Germany in 1963. The road was built shortly before the area was returned, without any connection to other roads in the to-be-German area, and was maintained by the Dutch Rijkswaterstaat. After 2002, connections to other roads were built. Contrary to the rest of Germany, freight trucks are still allowed to ride on this road, now the L410, on Sundays and public German holidays.
• A rural road in Narvik Municipality in Norway twice enters and leaves Swedish territory, following the southern shore of the lake Tjårdavatnet. The road does not connect with any other Swedish road in either location before it enters Norwegian land once more. It is private and built for hydropower plants but usable for public.[68][69]
• Norwegian road 92 continues in Finland as road 92 before it continues as road 92 again in Norway. Norwegian road 7012 continues as road Z821 in Sweden before continuing as road 7012 in Norway again. Road Z821 (near Gäddede) had right-hand driving also before 1967 when the rest of Sweden had left-hand driving. These roads are mostly number construction[clarification needed] and do not have special privileges.
• Road 402 between Podsabotin and Solkan in Slovenia, built when Slovenia was a state of Yugoslavia, passes through Italy for 1.5 kilometres (0.93 mi). This section of the road does not intersect any other roads and is confined by high concrete walls topped by fences. As Slovenia and Italy are now both signatories to the Schengen Agreement, the barriers are little more than historical curiosities, although there is modern signage indicating that photography is forbidden along the Italian part of the road and that stopping is prohibited.[70]
• The Saatse Boot Road in Estonia, between the villages of Lutepää and Sesniki, passes through Russian territory. The stretch of road passing through Russia is flanked by barbed wire fences and guard towers. Stopping and/or getting out of one's vehicle on the stretch of road is forbidden; the rule is enforced by Russian border guards.
• The D8 coastal highway of Croatia did pass through a small section of Bosnia and Herzegovina territory, at the coastal town of Neum, as it heads south from Split, Croatia, to Dubrovnik. The Pelješac Bridge has been built for road D8 to a Croatian peninsula, thereby bypassing Bosnian territory.
• The road M15 of Ukraine passes though Moldova at Palanca for 8 km. There are border controls at both border crossings.
• Geneva Airport in Switzerland has a French Sector, which, while legally and geographically in Switzerland, is a de facto French domestic terminal used solely for flights to and from destinations in metropolitan France, and staffed by French officials. Thus, prior to Switzerland's accession to the Schengen Area (which entered into force for air travel in March 2009),[71] the French Sector saved the need for border controls for flights between France and Geneva Airport.[72] The French Sector is only accessible by a road connecting it directly to France, which passes through Swiss territory but has no junctions or other physical access to Switzerland, thus bypassing Swiss passport controls when they were operational before 2009. While Switzerland's membership of the Schengen Area now renders the convenience of avoiding passport controls obsolete, there is still a small advantage gained in using the French Sector: Switzerland is not in the EU Customs Union, so customs (but not passport) checks are still carried out at Switzerland's border posts. The French Sector, with its road that leads directly to France without access to Switzerland, bypasses this requirement. Furthermore, France has reintroduced occasional border controls after 2016.

### Border transport infrastructure

#### Africa

The Kazungula Bridge curves in its path across the Zambezi River to avoid the immediately adjacent territory of Namibia and Zimbabwe.
1
Zambia
2
Botswana
3
Namibia
4
Zimbabwe

#### Americas

• In 2009, the Canada Border Services Agency relocated its border inspection post from Cornwall Island, Ontario, a border region with the United States, to Cornwall, Ontario, across from the island and thus further inland, after protests erupted over the CBSA's firearm policy on Mohawk Nation's sovereign land. To avoid severe penalty, people entering from the United States who are destined for the island are required to proceed across the island to report to the new CBSA post in Cornwall before making a U-turn to return to the island. Residents of the island visiting Cornwall or beyond must also report to the CBSA.[76] Those returning to the island from Cornwall are the only group not required to go through any border inspection.

#### Asia

• The Hong Kong–Shenzhen Western Corridor on the Hong Kongmainland China border: the immigration control points for Hong Kong (Shenzhen Bay Control Point) and mainland China (Shenzhen Bay Port) are co-located in the same building on the Shenzhen side of the bridge in an effective pene-exclave. The Hong Kong portion of the service building and the adjoining bridge are leased to Hong Kong, and are under Hong Kong's jurisdiction for an initial period until 30 June 2047.
• The Mainland Port Area in Kowloon High Speed Railway Station in downtown Hong Kong is under the jurisdiction of the mainland Chinese authorities and courts. The 30 km long tunnel to the border is under Hong Kong jurisdiction, however, the train compartments of any train in operation (that is carrying passengers to or from the Mainland) are subject to Mainland Laws and jurisdiction.[77] This arrangement was created to allow for immigration clearance to occur in Hong Kong for all trains travelling to and from the Mainland of China. This has stirred much controversy and multiple protests in Hong Kong.[78]
• As a legacy of British Malaya, the Malaysian rail network had its southern terminus at Tanjong Pagar railway station in central Singapore. The land on which the station and the rail tracks stood was leased to Keretapi Tanah Melayu, the Malaysian state railway operator. Consequently, Malaysia had partial sovereignty over the railway land.[79] Passengers had to clear Malaysian customs and immigration checks at Tanjong Pagar before boarding the train to Malaysia, even after Singapore shifted its border control facility to the actual border in 1998 and objected to the continued presence of Malaysian officials at the station. After a 20-year long dispute, the station was closed in 2011 and the railway land reverted to Singapore.[79] A remnant of the rail corridor is still in use; KTM trains now terminate at Woodlands Train Checkpoint in northern Singapore near the border, which houses Malaysian and Singaporean border controls for rail passengers.[80]

#### Europe

• Several bridges cross the rivers Oder and Neisse between Germany and Poland. To avoid needing to coordinate their efforts on a single bridge, the two riparian states assign each bridge to one or the other; thus Poland is responsible for all maintenance on some of the bridges, including the German side, and vice versa.[81]
• The Hallein Salt Mine crosses from Austria into Germany. Under an 1829 treaty Austria can dig under the then-Kingdom of Bavaria. In return some salt has to be given to Bavaria, and up to 99 of its citizens can be hired to work in the Austrian mine.[82]
• The twin town of TornioHaparanda or HaparandaTornio lies at the mouth of river Tornio, Tornio on the Finnish side and Haparanda on the Swedish side. The two towns have a common public transportation, as well as cultural services, fire brigade, sports facilities, etc.
• The Basel Badischer Bahnhof is a railway station in the Swiss city of Basel. Although situated on Swiss soil, because of the 1852 treaty between the Swiss Confederation and the state of Baden (one of the predecessors of today's Germany), the largest part of the station (the platforms and the parts of the passenger tunnel that lead to the German/Swiss checkpoint) is treated administratively as an inner-German railway station operated by the Deutsche Bahn. The shops in the station hall, however, are Swiss, and the Swiss franc is used as the official currency there (although the euro is universally accepted). The Swiss post office, car rental office, restaurant and a cluster of shops are each separately located wholly within a surrounding station area that is administered by the German railway.[83] The customs controls are located in a tunnel between the platforms and the station hall; international trains that continue to Basel SBB usually had on-board border controls, until they were abolished in 2008 when Switzerland joined the Schengen Area.
• The tram network in the French city of Strasbourg was extended into the neighbouring German city of Kehl in 2017.[84]
• The railway stations of Audun-le-Tiche and Volmerange-les-Mines are both located in France but are owned, operated and maintained by the Luxembourg National Railway Company, as are the short stretches of railway between the stations and the Luxembourg border. Thus, holders of a Luxembourg railway pass can travel to these stations without requiring a French ticket. The stations are both end stations on different lines and are not physically connected to any French railway. There are no border issues, as both France and Luxembourg are in the Schengen Area. Likewise, a short stretch of narrow-gauge railway line connects Hendaye in south-western France to the rest of the San Sebastián Metro network over the border in Spain.
• The bus network of Bratislava, the capital of Slovakia, extends to the nearby Austrian village Wolfsthal where the train S7 (Schnellbahn) from Vienna has its terminal station. After the fall of the Iron Curtain, the abandoned rail road track from Wolfsthal to Bratislava could not be reinstalled because the land had been sold for housing projects.

## Notes

1. ^ including sea territory, excluding international sea
2. ^ called maritime enclave if surrounded by alien territorial sea
3. ^ has direct access to international waters; a sovereign semi-en/exclave must have a land boundary longer than its coastline

## Citations

1. ^ a b Raton, Pierre (1958). "Les enclaves". Annuaire Français de Droit International. 4: 186. doi:10.3406/afdi.1958.1373.
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