The UK is a country in Western Europe, or, by some definitions, North, whose territory includes the island of Great Britain and the northern part of the island of Ireland, and many small islands around the archipelago. British territory shares a border with the Republic of Ireland, and is surrounded by the Atlantic Ocean with the North Sea to the east, the English Channel to the south and the Irish west sea. The UK covers an area of 610 km2 246, making it the 80th largest country in the world and 11th in Europe. The UK is the 22nd most populated country in the world with an estimated population of 65 million inhabitants. The UK is a constitutional monarchy; it has a parliamentary system of governance. Its capital is London, a world city and leading financial center in the world, but also Europe’s largest metropolitan area.