Great Britain is an island located northwest of continental Europe, separated from Europe by the North Sea and English Channel. The document discusses Great Britain's geography, history, capital cities, flora, and fauna. It notes that Great Britain was originally inhabited by people who crossed a land bridge from Europe, and that London, Edinburgh, and Cardiff serve as the capital cities of England, Scotland, and Wales respectively. The flora and fauna of Great Britain are less diverse than continental Europe due to the island's small size and recent geological history.