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This is a list of countries that have a land border with only one other country. The list does not include de facto independent disputed areas or unrecognised countries.

Some of these countries may be said to have several neighbours "by sea". As an example Denmark "borders" Sweden and Norway by sea, and Canada has sea boundaries with Denmark (between Baffin Island and Greenland) and France (between the island of Newfoundland and the territory of St. Pierre and Miquelon).

• Note on leased/ceded territories. Territory leased or ceded by one country to another for perpetual use, but not in sovereignty, such as Guantanamo Bay Naval Base in Cuba, or memorials, such as the American Cemetery in France, do not constitute true territorial borders, because the land occupied remains a formal part of the host country.

Countries bordering only one other country

Country	Neighbour	Border length (km)	Notes
Brunei	Malaysia	381	Borders the Malaysian state of Sarawak on the island of Borneo.
Canada	United States	8,893	Canada shares a (disputed) land border with Denmark on Hans Island.
Denmark	Germany	68	Denmark shares a (disputed) land border with Canada on Hans Island. Also connected to Sweden via the Øresund Bridge, see below.
Dominican Republic	Haiti	360	On the island of Hispaniola.
Gambia	Senegal	740
Haiti	Dominican Republic	360	On the island of Hispaniola.
Ireland	United Kingdom	360	The Republic of Ireland borders the United Kingdom on the island of Ireland.
Lesotho	South Africa	909	Lesotho is an enclave entirely surrounded by South Africa.
Monaco	France	4.4
Papua New Guinea	Indonesia	820	On the island of New Guinea.
Portugal	Spain	1,214
Qatar	Saudi Arabia	60
San Marino	Italy	39	San Marino is an enclave entirely surrounded by Italy.
South Korea	North Korea	238	On the Korean Peninsula, at the Demarcation Line. The two countries are separated by a 4 km wide Demilitarized Zone.
Timor-Leste	Indonesia	228	On the island of Timor.
United Kingdom	Ireland	360	The United Kingdom borders the Republic of Ireland on the island of Ireland. The UK is also connected to France via the Channel Tunnel, see below. Of the four "constituent countries" of the UK, only England borders more than one other distinct territory.
Vatican City	Italy	3.2	The Vatican is an enclave entirely surrounded by Italy.

Causeways, bridges, and tunnels

Borders relevant to this list may arguably include short theoretical borders in the middle of man-made constructions. A bridge does not constitute a land border; however the status of tunnels as "true" land borders is disputed, as these exist on land, but not on the surface.^{[citation needed]} Also artificial islands or causeways could be disputed.^{[citation needed]}

• Denmark, in addition to its border with Germany, technically also has an extremely short border with Sweden across the Oresund Bridge.
• Singapore, although an island nation with no natural land borders, is connected to Malaysia by the Johor Causeway and the Malaysia-Singapore Second Link.
• Bahrain, likewise an island nation, is connected to Saudi Arabia by the King Fahd Causeway; the Qatar–Bahrain Friendship Bridge connecting it to Qatar is planned but as yet incomplete.
• The United Kingdom, in addition to its border with Ireland, has a border with France in the Channel Tunnel.

Dependent territories

In some cases, a dependent territory of one nation borders another nation.

• Akrotiri and Dhekelia, a British sovereign base area, borders the Republic of Cyprus. Dhekelia borders also the Turkish Republic of Northern Cyprus, but the latter is recognised only by Turkey.
• Gibraltar, a British overseas territory, occupies a small peninsula and has a 1.2 km land border with Spain.
• Hong Kong, comprising a continental portion and more than 200 islands in the South China Sea, was formerly ceded and leased by Qing China to the United Kingdom. It was returned to the People's Republic of China in 1997, but has since then operated with its own judicial system under the policy of "One Country, Two Systems". The land border and coastline, although no longer one between two states, are still controlled as though Hong Kong were an international exclave.
• Macau, comprises a peninsula and two islands in the South China Sea, 60 km west of Hong Kong, and like Hong Kong was formerly administered by a colonial power (in this case, Portugal) but returned to the People's Republic of China in 1999. It too has its own judicial system and retains border and coastal controls similar to those of an exclave.
• The island of Saint Martin is split between two island territories: the northern half, Saint-Martin, is a French overseas collectivity; the southern half, Sint Maarten, is part of the Netherlands Antilles.

Historical

There are many countries that historically had only one neighbour. Some no longer exist while others now have either no land borders or borders with more than one nation due to map changes.

• Korea bordered only China for several hundred years before 1860, after which a second international border with Russia appeared, according to the Convention of Peking.
• Ciskei, one of the South African "independent" homelands, reincorporated on April 27, 1994.
• Dominion of Newfoundland, with Canada, until March 31, 1949 when it became the Canadian province of Newfoundland (now named Newfoundland and Labrador).
• Scotland and England bordered each other until 1707 when Scotland and England were united by the Acts of Union, see Anglo-Scottish border.

See also

• Enclave and exclave
• Island country
• Land borders
• Separation barrier
• Landlocked country
• List of countries and territories by land and maritime borders
• List of enclaves and exclaves
• List of island countries
• List of divided islands
• List of political and geographic borders
• List of sets of four countries that border one another