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United Kingdom

The United Kingdom of Great Britain and Northern Ireland (commonly known as the United Kingdom, the U.K., or Britain) is a country to the northwest of mainland Europe . It comprises the island of Great Britain , the northeast part of the island of Ireland and many small islands. Northern Ireland is the only part of the UK with a land border, sharing it with the Republic of Ireland . Apart from this land border, the UK is surrounded by the Atlantic Ocean , the North Sea , the English Channel and the Irish Sea . The largest island, Great Britain , is linked to France by the Channel Tunnel .