Earth's Most Pristine Reef! The British Indian Ocean Territory (BIOT/Chagos Archipelago) is simultaneously one of Earth's most biodiverse marine environments and one of its most politically contested territories. Diego Garcia hosts a joint UK-US military base. Access to civilians is generally prohibited — making this the world's most significant untouched coral ecosystem.
No civilian accommodation exists. The territory is home to the US-UK military base on Diego Garcia only. Access is restricted to authorised military personnel. Occasional scientific research vessel expeditions may anchor briefly in outer atoll waters with permission.
The Chagos Archipelago's coral reefs are the Indian Ocean's least disturbed ecosystem — 55 islands, 60,000km² of pristine marine protected area. For the extraordinary few who visit on research permits or yacht passage, the snorkelling and diving in Peros Banhos and Salomon atolls rank among Earth's finest.
The BIOT Marine Protected Area (MPA) — one of the world's largest at 640,000km² — was declared in 2010 and protects an extraordinary range of coral species, green sea turtles, sharks and seabirds. A 2024 agreement between the UK and Mauritius transfers sovereignty — monitor for changes to access policy.
No civilian cuisine or restaurants exist. Military base personnel access US-standard dining.
The ongoing sovereignty dispute between the UK and Mauritius is the territory's most significant "event" — a 2024 treaty transfers sovereignty to Mauritius while maintaining the US-UK military base. This may change future civilian access rules.
No public festivals. The Chagossian diaspora (the indigenous Ilois people forcibly displaced from 1968-1973 to make way for the military base) observe their exile anniversaries in Mauritius and the UK.
No civilian access means no civilian health infrastructure. Military base has medical facilities for personnel only.
Military satellite and base internet only — no civilian connectivity.
