- a British colony in the Indian Ocean, consisting of the Chagos Archipelago. 76 sq. mi. (177 sq. km). Capital: Diego Garcia.
- a UK Overseas Territory in the Indian Ocean: consists of the Chagos Archipelago (formerly a dependency of Mauritius) and formerly included (until 1976) Aldabra, Farquhar, and Des Roches, now administratively part of the Seychelles. Diego Garcia is an important US naval base
