British Isles

British Isles are a group of islands in the North Atlantic off the north-western coast of continental Europe, consisting of the islands of Great Britain, Ireland, the Isle of Man, the Hebrides and over six thousand smaller islands.

Isles
At one time the region was part of Doggerland, an area of land that connected Great Britain to continental Europe. After the last glacial period, it was flooded by rising sea levels. Doggerland submerged beneath the southern North Sea, and flooding formed Britain into an island. The oldest rocks are found in Ireland, Wales and the northwest of Scotland.