List of countries that border only one other country

This is a list of sovereign countries that border only one other country, with only land borders being counted. 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). Other countries may only border one country by sea.

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	The border around the area of Hans Island between Canada and Greenland (a Danish dependent territory) is disputed and undefined. Canada also shares a maritime border with Saint Pierre and Miquelon, a French dependent territory
Denmark	Germany	68	Denmark is connected to Sweden via the Øresund Bridge. The border around the area of Hans Island between Canada and Greenland (a Danish dependent territory) is disputed and undefined. See dependent territories below.
Dominican Republic	Haiti	360	On the island of Hispaniola.
Gambia	Senegal	740	The Republic of Gambia is bordered north, south and east by Senegal.
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	Monaco is surrounded on three sides by France, the last bordering the Mediterranean.
Papua New Guinea	Indonesia	820	On the island of New Guinea.
Portugal	Spain	1,214
Qatar	Saudi Arabia	60	The planned Qatar–Bahrain Friendship Bridge would connect Qatar to Bahrain.
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. The UK sovereign base areas Akrotiri and Dhekelia share borders with Cyprus. Gibraltar, a UK overseas territory, shares a border with Spain. See dependent territories below.
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. 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.

Greenland, a Danish dependent territory, has a border dispute with Canada around the area of Hans Island. Canada recognises the international border as crossing through the middle of the Island.
Akrotiri and Dhekelia, British sovereign base areas, border the Republic of Cyprus. Dhekelia also borders 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.
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 one of the four constituent countries that form the Kingdom of the Netherlands.

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).
The Kingdom of Scotland and the Kingdom of England bordered each other until 1707 when Scotland and England were united by the Acts of Union, see Anglo-Scottish border.
Japan bordered Russia on the island of Sakhalin from 1905 until 1910, when a second border with Manchuria China and Russian Far East appeared upon annexation of Korea. Both Sakhalin and Korea were relinquished in 1945.

List of countries that border only one other country

Countries bordering only one other country

Causeways, bridges, and tunnels

Dependent territories

Historical

References

See also