Great Britain: An Island Nation on the European Continental Shelf

Great Britain is the largest island in the British Isles and the ninth-largest island in the world. Geographically, it sits on the European continental shelf, separated from mainland Europe by the North Sea and English Channel (narrowest point: 33 km / 21 mi at the Strait of Dover).

Politically, "Great Britain" refers to the island comprising three countries: England, Scotland, and Wales. Together with Northern Ireland, they form the United Kingdom of Great Britain and Northern Ireland.

Key Geographic Facts

• Area: 209,331 km² (80,823 sq mi)
• Population: ~67 million (2023)
• Highest point: Ben Nevis, Scotland (1,345 m / 4,413 ft)
• Surrounding seas: North Sea (east), English Channel (south), Celtic Sea (southwest), Irish Sea (west), Atlantic Ocean (north/west)

Notable Surrounding Islands

The British Isles include ~6,000 smaller islands. Major groups:

• Isle of Wight (English Channel)
• Channel Islands (Jersey, Guernsey, etc.—Crown Dependencies, not UK)
• Hebrides (Inner and Outer, off western Scotland)
• Orkney and Shetland (northern Scotland)
• Isle of Man (Irish Sea—Crown Dependency)

While politically distinct from the European Union since Brexit (2020), Great Britain remains geographically, geologically, and historically part of the European continent.