British Indian Ocean Territory

Geography FAQ

The British Indian Ocean Territory is a British Overseas Territory situated in the Indian Ocean within the region of Asia. The territory spans a total land area of 60 square kilometres.

What geographical features comprise the territory?

The territory comprises the seven atolls of the Chagos Archipelago, containing over 1,000 individual islands. The largest and most southerly island is Diego Garcia, which covers 27 square kilometres and serves as the site of a Joint Military Facility of the United Kingdom and the United States.

Where are the geographic coordinates located?

The geographic coordinates for the territory are latitude -7.26229 and longitude 72.37676.

Who is permitted to live on the islands based on geography?

Since 1971, only personnel of the British and United States military and associated contractors have been legally allowed to live on the Chagos Islands.

Additional geographic and administrative details are available through the British Indian Ocean Territory documentation and the GeoNames record for British Indian Ocean Territory.

The British Indian Ocean Territory is a British Overseas Territory situated in the Indian Ocean. The territory encompasses the seven atolls of the Chagos Archipelago with a total land area of 60 square kilometres.

The local economy and travel landscape of the territory are shaped entirely by the presence of a Joint Military Facility of the United Kingdom and the United States located on the largest and most southerly island, Diego Garcia. Official administration is conducted remotely from London, with the local capital regarded as being on Diego Garcia.

Civilian access and travel to the islands are strictly controlled. Since 1971, only personnel of the British and United States military and associated contractors have been legally allowed to live on the Chagos Islands. The population stands at 4,000, consisting primarily of military personnel and contractors. The United States dollar (USD) serves as the currency used within the territory, and English (en-IO) functions as the official language.

Further details regarding the region are documented on the British Indian Ocean Territory page and the GeoNames record for British Indian Ocean Territory.

Culture And Arts In The British Indian Ocean Territory

The British Indian Ocean Territory is a British Overseas Territory situated in the Indian Ocean, comprising the seven atolls of the Chagos Archipelago with over 1,000 individual islands. The territory covers a total land area of 60 square kilometres, with Diego Garcia serving as the largest and most southerly island at 27 square kilometres.

Regarding the present-day economy and administrative structure of the territory, official management is conducted remotely from London, while the local capital is frequently regarded as being situated on Diego Garcia. The economy and daily functions of the islands are heavily defined by the presence of a Joint Military Facility operated by the United Kingdom and the United States.

Since 1971, only personnel of the British and United States military and associated contractors have been legally permitted to live on the Chagos Islands. The territory utilizes the United States dollar as its currency and uses the language code en-IO. Cultural expression and traditional arts within the territory have been profoundly impacted by the historical removal of the Chagossian population between 1968 and 1973, as well as ongoing legal and political developments concerning settlement rights on islands such as Île du Coin.

For further geographical and administrative records, consult the GeoNames record for British Indian Ocean Territory and the broader overview available at the British Indian Ocean Territory article.

The British Indian Ocean Territory (BIOT) is a British Overseas Territory in the Indian Ocean.

It comprises the seven atolls of the Chagos Archipelago, containing over 1,000 islands and a total land area of 60 square kilometres.

Present‑day economy is defined by the joint UK‑US military presence

The only sustained economic activity on the territory is the operation of the Joint Military Facility on Diego Garcia, the largest island at 27 square kilometres. The facility supports naval, air and logistical operations for both the United Kingdom and the United States, and it generates employment for military personnel, civilian contractors and support staff who together constitute the de facto population of roughly 4 000 people, as recorded in the official statistics.

All financial transactions on the islands are conducted in United States dollars, the designated currency, and the official language used for administration is English as spoken in the territory (en‑IO). No commercial agriculture, tourism or manufacturing operates beyond the limited supply services required for the base.

Administrative framework

Official administration is exercised remotely from London, while the functional hub is regarded as Diego Garcia. The United Kingdom retains sovereignty, but a 2025 treaty provides for a 99‑year lease of the military installation to the United States, pending ratification that was suspended in 2026 after political opposition.

Legal residency is restricted to military personnel and authorized contractors; since 1971 no other civilians have been permitted to settle permanently. Attempts by former Chagossians to re‑establish a community on Île du Coin in 2026 have been challenged in court, and the territory’s Supreme Court ruled in March 2026 that they have a right to live on the islands, a decision currently under appeal.

Geopolitical context

Mauritius continues to claim sovereignty over the archipelago, a position supported by a 2019 International Court of Justice advisory opinion and subsequent United Nations resolutions. Negotiations between the United Kingdom and Mauritius in 2022–2024 produced a 2024 understanding that the UK would cede the territory while preserving the joint military base.

Attribute	Detail
Official name	British Indian Ocean Territory
ISO 2‑letter code	IO
ISO 3‑letter code	IOT
Region	Asia
Population (2026)	4 000
Area	60 km²
Currency	USD
Languages	en‑IO

For further details, see the British Indian Ocean Territory article and the GeoNames record for British Indian Ocean Territory.