The United Kingdom of Great Britain and Northern Ireland (the UK) occupies most of the territory of the British Isles. It consists of four main parts: England, Scotland, Wales and Northern Ireland. London is the capital of England, Edinburgh is the capital of Scotland, Cardiff — of Wales and Belfast — of Northern Ireland. The UK is a small country with an area of some 244,100 square kilometres. It occupies only 0.2 per cent of the world s land surface. It is washed by the Atlantic Ocean in the north-west, north and south-west and separated from Europe by the North Sea in the east and by the English Channel in the south. The Strait of Dover or Pas de Calais is the narrowest part of the Channel. The North Sea and the English Channel are often called "the narrow seas"; they are not deep but are frequently rough and difficult to navigate during storms.