The United Kingdom is a sovereign state located off the north-western coast of continental Europe. The United Kingdom is made up of four countries – England, Scotland, Wales and Northern Ireland. With a total area of approximately 244,376 square kilometres (94,354 sq mi), the UK occupies the major part of the British Isles archipelago and includes the island of Great Britain, the north-eastern one-sixth of the island of Ireland and many smaller surrounding islands. It is the world's 7th largest island country. The mainland areas lie between latitudes 49°N and 59°N, and longitudes 8°W to 2°E. The Royal Observatory, Greenwich, in south-east London, is the defining point of the Prime Meridian.