Based on the text, complete the sentences about the United Kingdom:

Britain, which is formally known as the United Kingdom of Great Britain and Northern Ireland, is the political unity of four countries. It is located in Western Europe. Its total area is about 242,500 square kilometers. The coasts of the UK are washed by the Atlantic Ocean, the North Sea, the English Channel and the Irish Sea. The scenery is varied and includes mountains, hills, and plains. The capital of the UK is London. The official language is English. The national symbols of the UK are the Union Jack flag, the Royal Coat of Arms, and the lion. Its form of government is a parliamentary democracy. Officially, the supreme legislative authority is the Parliament and the two Houses of Parliament: the House of Commons and the House of Lords. But the Queen is the Head of State. There are three major political parties: the Conservative Party, the Labour Party, and the Liberal Democrats. The largest cities are London, Birmingham, Manchester, Glasgow. The chief river is the Thames. Britain's major industries include finance, manufacturing, and tourism.