The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a sovereign state located off the north-western coast of continental Europe. The country includes the island of Great Britain (a term sometimes also loosely applied to the whole state), the north-eastern part of the island of Ireland, and many smaller islands. Northern Ireland is the only part of the UK that shares a land border with another state: the Republic of Ireland.
The Wikipedia page is 
See also the relevant UK categories