The largest island of the British Isles is Great Britain which is also the world’s ninth-biggest island. It has an area of 209,331 square km. The Ireland island is located to the west of Great Britain. The island is politically part of the UK. Most of Scotland, England, and Wales are on this island. A maritime climate prevails here. The island is part of the European continental shelf. The English Channel and the North Sea separates the island from the rest of continental Europe to the east. The world’s longest tunnel below the sea, the Channel Tunnel, connects the island to the mainland Europe. Great Britain is surrounded by more than 1,000 island and islets.