| Term | Definition | Includes |
|---|---|---|
| Great Britain | Largest island of the British Isles | England, Scotland, Wales |
| United Kingdom (UK) | Sovereign state | Great Britain + Northern Ireland |
| British Isles | Geographical archipelago | Great Britain, Ireland (Republic + NI), Isle of Man, Channel Islands, 6,000+ smaller islands |
Key: Great Britain = geographic island; UK = political country; British Isles = geographic group (includes Republic of Ireland, which is not in the UK).