It is connected to continental Europe by the Channel Tunnel, which at 31 miles (50 km) (24 miles (38 km) underwater) is the longest underwater tunnel in the world.England accounts for just over half of the total area of the UK, covering 130,395 square kilometres (50,350 sq mi).
The 14, or possibly 15, Welsh mountains over 3,000 feet (914 m) high are known collectively as the Welsh 3000s.
Lowland areas – especially the narrow waist of land between the Firth of Clyde and the Firth of Forth known as the Central Belt – are flatter and home to most of the population including Glasgow, Scotland's largest city, and Edinburgh, its capital and political centre.
A view of Ben Nevis in the distance, fronted by rolling plains Ben Nevis, in Scotland, is the highest point in the British Isles Wales accounts for less than a tenth of the total area of the UK, covering 20,779 square kilometres (8,020 sq mi).
Northern Ireland shares a 224-mile (360 km) land boundary with the Republic of Ireland.
The coastline of Great Britain is 11,073 miles (17,820 km) long.
The highest peak in Northern Ireland is Slieve Donard in the Mourne Mountains at 852 metres (2,795 ft).