United kingdom

The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom or Britain, is a sovereign state in Europe.Its capital is London.The United Kingdom is a constitutional monarchy with a parliamentary system of governance. Northern Ireland is the only part of the UK that shares a land border with another sovereign state,the Republic of Ireland.The UK is surrounded by the Atlantic Ocean, with the North Sea to its east, the English Channel to its south and the Celtic Sea to its south-southwest.It is also the 21st most populous country, with an estimated 65.1 million inhabitants.Together, this makes it the fourth most densely populated country in the European Union.