The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain,[m] is a country in Northwestern Europe, off the coast of the continental mainland.[21][22] It comprises England, Scotland, Wales, and Northern Ireland.[n][23] The UK includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of the smaller islands within the British Isles, a total area of 94,354 square miles (244,376 km2).[f][12][24] Northern Ireland shares a land border with the Republic of Irelan