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).
|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.|
|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.|
|Papua New Guinea||Indonesia||820||On the island of New Guinea.|
|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.|
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. Also artificial islands or causeways could be disputed.
In some cases, a dependent territory of one nation borders another nation.
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.