| Total area | No authoritative open source found |
| Exclusive economic zone (EEZ) | No authoritative open source found |
| Administrative divisions (ADM1) | No authoritative open source found |
| Location | Western Europe, island in the English Channel, northwest of FranceCIA World Factbook [2025] · 2026 archive |
| Coastline | 70 kmCIA World Factbook [2025] · 2026 archive |
| Land boundaries | 0 kmCIA World Factbook [2025] · 2026 archive |
| Bordering countries | No authoritative open source found |
| Terrain | gently rolling plain with low, rugged hills along north coastCIA World Factbook [2025] · 2026 archive |
| Climate | temperate; mild winters and cool summersCIA World Factbook [2025] · 2026 archive |
| Natural resources | arable landCIA World Factbook [2025] · 2026 archive |
| Highest point | Les Platons 136 mCIA World Factbook [2025] · 2026 archive |
| Lowest point | English Channel 0 mCIA World Factbook [2025] · 2026 archive |
| Mean elevation | No authoritative open source found |
| Area (comparative) | about two-thirds the size of Washington, D.C.CIA World Factbook [2025] · 2026 archive |
| Natural hazards | very large tidal variation can be hazardous to navigationCIA World Factbook [2025] · 2026 archive |
| Maritime claims | territorial sea: 12 nm; exclusive fishing zone: 12 nmCIA World Factbook [2025] · 2026 archive |