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The United Kingdom of Great Britain and Northern Ireland, commonly known as Britain or the United Kingdom, is a sovereign country in Western Europe. The United Kingdom is located on the northwest coast of mainland Europe and includes the United Kingdom, the northeastern part of Ireland and many smaller islands. Northern Ireland is the only part of the United Kingdom that shares a land border with another sovereign state - the Republic of Ireland. Apart from this land border, Britain is surrounded by the Atlantic Ocean, with the North Sea to the east, the English Channel to the south, and the Celtic Sea to the south-southwest, making it the world's 12th-longest coastline. The Irish Sea lies between Great Britain and Ireland. With an area of 242,500 square kilometers, Great Britain is the 78th largest state in the world. It is also the 21st most populated country with an estimated 65.5 million inhabitants in 2016.