British Indian Ocean Territory

The British Indian Ocean Territory (BIOT) is an overseas territory of the United Kingdom situated in the Indian Ocean halfway between Tanzania and Indonesia, and directly south of the Maldives. The territory comprises the seven atolls of the Chagos Archipelago with over 1,000 individual islands  many very small  amounting to a total land area of 60 square kilometres (23 sq mi).[5] The largest and most southerly island is Diego Garcia, 27 km2 (10 sq mi), the site of a joint military facility of the United Kingdom and the United States.

British Indian Ocean Territory
"In tutela nostra Limuria" (Latin)
(English: "Limuria is in our charge")[1]
Anthem: "God Save the Queen"
Location of the British Indian Ocean Territory (circled in red)
Sovereign stateUnited Kingdom
Cession from France30 May 1814
Separation from Mauritius8 November 1965
and settlement
Camp Justice
7°18′S 72°24′E
Official languagesEnglish
GovernmentDependency under a constitutional monarchy
Elizabeth II
Ben Merrick
Linsey Billing[2]
 UK government minister
Tariq Ahmad
54,400 km2 (21,000 sq mi)
60 km2 (23 sq mi)
 Water (%)
 Non‑permanent 2012 estimate
c. 2,500 military personnel and contractors
 Permanent inhabitants
58.3/km2 (151.0/sq mi)[3]
Time zoneUTC+06:00
Driving sideright
Calling code+246
UK postcode
ISO 3166 codeIO

The only inhabitants of the territory are US and British military personnel and associated contractors, who collectively number around 2,500 (2012 figures).[3] The removal of Chagossians from the Chagos Archipelago occurred between 1968 and 1973. The Chagossians, then numbering about 2,000 people, were expelled by the British government to Mauritius and the Seychelles to allow the United States to build a joint UK/US military base there. Today, the exiled Chagossians are still trying to return, arguing that the forced expulsion and dispossession was illegal.[8][9] The islands are off-limits to Chagossians, casual tourists, and the media.

Since the 1980s the government of Mauritius has sought to regain control over the Chagos Archipelago, which was separated from the British Colony of Mauritius by the UK in 1965 to form the British Indian Ocean Territory. On 23 June 2017, the United Nations General Assembly (UNGA) voted in favour of referring the territorial dispute between Mauritius and the UK to the International Court of Justice (ICJ) in order to clarify the legal status of the Chagos Islands archipelago in the Indian Ocean. The motion was approved by a majority vote with 94 voting for and 15 against.[10][11] Judge Abdulqawi Ahmed Yusuf described the UK's administration of the Chagos Islands as "an unlawful act of continuing character". In February 2019, the International Court of Justice in The Hague ruled that Britain should transfer the islands to Mauritius as they were not legally separated from the latter in 1965.[12]


Maldivian mariners knew the Chagos Islands well.[13] In Maldivian lore, they are known as Fōlhavahi or Hollhavai (the latter name in the closer Southern Maldives). According to Southern Maldivian oral tradition, traders and fishermen were occasionally lost at sea and got stranded on one of the islands of the Chagos. Eventually, they were rescued and brought back home. However, these islands were judged to be too far away from the seat of the Maldivian crown to be settled permanently by them. Thus, for many centuries the Chagos were ignored by their northern neighbours.

The islands of Chagos Archipelago were charted by Vasco da Gama in the early sixteenth century, then claimed in the eighteenth century by France as a possession of Mauritius. They were first settled in the 18th century by African slaves and Indian contractors brought by Franco-Mauritians to found coconut plantations.[14] In 1810, Mauritius was captured by the United Kingdom, and France ceded the territory in the Treaty of Paris.

In 1965, the United Kingdom split the Chagos Archipelago from Mauritius and the islands of Aldabra, Farquhar and Desroches (Des Roches) from the Seychelles to form the British Indian Ocean Territory. The purpose was to allow the construction of military facilities for the mutual benefit of the United Kingdom and the United States. The islands were formally established as an overseas territory of the United Kingdom on 8 November 1965.[15] On 23 June 1976, Aldabra, Farquhar and Desroches were returned to Seychelles as a result of its attaining independence. Subsequently, BIOT has consisted only of the six main island groups comprising the Chagos Archipelago.

In 1990, the first BIOT flag was unfurled. This flag, which also contains the Union Jack, has depictions of the Indian Ocean, where the islands are located, in the form of white and blue wavy lines and also a palm tree rising above the British crown.[16]

Forced depopulation

In 1966, the British government purchased the privately owned copra plantations and closed them. Over the next five years, the British authorities forcibly and clandestinely removed the entire population of about 2,000 people, known as Chagossians (or Ilois), from Diego Garcia and two other Chagos atolls, Peros Banhos and Salomon Islands, to Mauritius.[17] In 1971, the United Kingdom and the United States signed a treaty, leasing the island of Diego Garcia to the US military for the purposes of building a large air and naval base on the island. The deal was important to the UK government, as the United States granted it a substantial discount on the purchase of Polaris nuclear missiles in return for the use of the islands as a base.[18] The strategic location of the island was also significant at the centre of the Indian Ocean, and to counter any Soviet threat in the region.

Work on the military base commenced in 1971, with a large airbase with two parallel 12,000-foot-long (3,700 m) runways constructed, as well as a harbour suitable for large naval vessels. Although classed as a joint UK/US base, in practice it is primarily staffed by the US military, although the British maintain a garrison at all times, and Royal Air Force long range patrol aircraft are deployed there. The United States Air Force used the base during the 1991 Gulf War and the 2001 war in Afghanistan, as well as the 2003 Iraq War.

During the 1980s, Mauritius asserted a claim to sovereignty for the territory, citing the 1965 separation as illegal under international law, despite their apparent agreement at the time. The UK does not recognise Mauritius's claim, but has agreed to cede the territory to Mauritius when it is no longer required for defence purposes.[19] The Seychelles also made a sovereignty claim on the islands.[20]

The islanders and their descendants, who now reside in Mauritius, the Seychelles, and the UK,[21] have continually asserted their right to return to Diego Garcia, winning important legal victories in the English High Court in 2000, 2006 and 2007. However, in the High Court and Court of Appeal in 2003 and 2004, the islanders' application for further compensation on top of the £14.5 million value package of compensation they had already received was dismissed by the court.

On 11 May 2006, the High Court ruled that a 2004 Order in Council preventing the Chagossians' resettlement of the islands was unlawful, and consequently that the Chagossians were entitled to return to the outer islands of the Chagos Archipelago.[22] On 23 May 2007, this was confirmed by the Court of Appeal.[23] In a visit sponsored by the British government, the islanders visited Diego Garcia and other islands on 3 April 2006 for humanitarian purposes, including the tending of the graves of their ancestors.[24] On 22 October 2008, the British government won an appeal to the House of Lords regarding the royal prerogative used to continue excluding the Chagossians from their homeland.[25][26]

According to a WikiLeaks disclosure document,[27] in a calculated move in 2009 to prevent re-settlement of the BIOT by the Chagossians, the UK proposed that the BIOT become a "marine reserve" with the aim of preventing the former inhabitants from returning to the islands. The summary of the diplomatic cable is as follows:

HMG would like to establish a "marine park" or "reserve" providing comprehensive environmental protection to the reefs and waters of the British Indian Ocean Territory (BIOT), a senior Foreign and Commonwealth Office (FCO) official informed Polcouns on 12 May. The official insisted that the establishment of a marine park – the world's largest – would in no way impinge on USG use of the BIOT, including Diego Garcia, for military purposes. He agreed that the UK and U.S. should carefully negotiate the details of the marine reserve to assure that U.S. interests were safeguarded and the strategic value of BIOT was upheld. He said that the BIOT’s former inhabitants would find it difficult, if not impossible, to pursue their claim for resettlement on the islands if the entire Chagos Archipelago were a marine reserve.

The UK government established a marine reserve in April 2010 to mixed reactions from Chagossians. While the UK Foreign Office claimed that it was an environmental move as well as a necessary move to improve the coral populations off east Africa and therefore sub-Saharan marine supplies, some Chagossians claimed that the reserve would prevent any resettlement due to the inability to fish in protected areas. The Chagossian UK-based Diego Garcian Society stated that it welcomed the marine reserve, noting that it was in the interest of Chagossians to have the area protected while they were exiled and that it could be renegotiated upon resettlement. The Foreign Office claimed the reserve was made "without prejudice to the outcome of the current, pending proceedings before the European Court of Human Rights".[28]

On 1 December 2010, a leaked US Embassy London diplomatic cable exposed British and US communications in creating the marine nature reserve. The cable relays exchanges between US Political Counselor Richard Mills and British Director of the Foreign and Commonwealth Office Colin Roberts, in which Roberts "asserted that establishing a marine park would, in effect, put paid to resettlement claims of the archipelago's former residents."[29] Richard Mills concludes: "Establishing a marine reserve might, indeed, as the FCO's Roberts stated, be the most effective long-term way to prevent any of the Chagos Islands' former inhabitants or their descendants from resettling in the BIOT."[29] The cable (reference ID "09LONDON1156") was classified as confidential and "no foreigners", and leaked as part of the Cablegate cache.

Government, politics and law


As a territory of the United Kingdom, the head of state is Elizabeth II. There is no governor appointed to represent the Queen on the territory, as there are no longer any native inhabitants. The head of government is the commissioner, currently Ben Merrick (since August 2017, replacing John Kittmer), and administrator John McManus (since April 2011,[2] replacing Joanne Yeadon), all of whom reside in the United Kingdom. The commissioner's representative in the territory is the officer commanding the detachment of British forces.

Politics and law

The laws of the territory are based on the territorial constitution set out in the British Indian Ocean Territory (Constitution) Order 2004,[30] which gives the Commissioner full powers to make laws for the territory.[2][31] If the Commissioner has not made a law on a particular topic then, in most circumstances, the laws that apply in the BIOT are the same as those that apply in England under the terms of the Courts Ordinance 1983.[32] However, since almost all residents of the BIOT are members of the United States military, in practice crimes are more commonly charged under United States military law.

Applicable treaties between the United Kingdom and the United States govern the use of the military base. The United States is required to ask permission of the United Kingdom to use the base for offensive military action.


The territory is an archipelago of 55 islands,[2] the largest being Diego Garcia, accounting for almost half of the total land area of the territory, which is 60 km². The terrain is flat and low, with most areas not exceeding 2 metres above sea level. The climate is tropical marine; hot, humid, and moderated by trade winds.[33] In 2010 545,000 square kilometres (210,426 sq mi) of ocean around the islands was declared a marine reserve.[28]

With the exception of one two-lane motorway, most of the islands in the territory have no roads of any sort.[33] Diego Garcia has a short stretch of paved road between the port and airfield; otherwise transport is mostly by bicycle.[5][33] Diego Garcia's military base is home to the territory's only airport. At 3000 metres long, it is capable of supporting heavy USAF bombers such as the B-52 and would have been able to support the Space Shuttle in the event of a mission abort.[34] It also has a major seaport.

There is also a marina bus service along the main road of the island.[35]

The island had many wagonways, which were donkey-hauled narrow gauge railroads for the transport of coconut carts. These are no longer in use and have deteriorated.[36]


On 1 April 2010, the Chagos Marine Protected Area (MPA) was declared to cover the waters around the Chagos Archipelago. However Mauritius objected stating this was contrary to its legal rights, and on 18 March 2015 the Permanent Court of Arbitration ruled that the Chagos Marine Protected Area was illegal under the United Nations Convention on the Law of the Sea as Mauritius had legally binding rights to fish in the waters surrounding the Chagos Archipelago, to an eventual return of the Chagos Archipelago, and to the preservation of any minerals or oil discovered in or near the Chagos Archipelago prior to its return.[37][38]

The MPA's declaration doubled the total area of environmental no take zones worldwide. The benefits of protecting this area:

  • Provides an environmental benchmark for other areas. Unlike the rest of the world, the BIOT has been relatively untouched by man's actions.
  • Providing a natural laboratory to help understand climate change.
  • Opportunity for research related to marine science, biodiversity, and climate change.
  • Acting as a reserve for species in danger in other areas.
  • Providing an export of surplus juveniles, larvae, seeds, and spores to help with output in neighbouring areas.[39]

The area had already been declared an Environmental (Preservation and Protection) Zone, but since the establishment of the MPA, fishing is no longer permitted in the area.

MV Pacific Marlin

The BIOT Patrol Vessel the MV Pacific Marlin is based in Diego Garcia. It is presently operated by the Swire Pacific Offshore Group under a 4-year contract with the BIOT Administration, which was renewed on 1 January 2011. The MV Pacific Marlin patrols the marine reserve all year, and since the marine reserve was designated in April 2010, the number of apprehensions of illegal vessels within the area has increased. The Pacific Marlin was built in 1978 as an oceangoing tug. It is 57.7 metres long with a draft of 3.8 metres and gross tonnage 1,200. It has a maximum speed of 12.5 knots with an economic speed of 11 knots, permitting a range of about 18,000 nautical miles and fuel endurance of 68 days. It is the oldest vessel in the Swire fleet.[40][41]


The total population was reported at 4,000 in 2006, of whom 2,200 were American military personnel or contractors, 1,400 were Filipino contract workers, 300 were Mauritian contract workers, and 100 were members of the British Armed Forces.[42] It is believed the population has significantly decreased since the end of US bombing operations from the island in August 2006.


All economic activity is concentrated on Diego Garcia, where joint Anglo-American defence facilities are located. Approximately 2,000 native inhabitants, known as the Chagossians or Ilois were forcibly relocated to Mauritius before construction of these facilities; in 1995, there were approximately 1,700 UK and US military personnel and 1,500 civilian contractors living on the island.

Construction projects and various services needed to support the military installations are carried out by military and contract employees from Britain, Mauritius, the Philippines, and the US. There are no industrial or agricultural activities on the islands. Until the creation of the marine sanctuary, the licensing of commercial fishing provided an annual income of about $1 million for the territory.[43]


Postage stamps have been issued for the British Indian Ocean Territory since 17 January 1968. As the territory was originally part of Mauritius and the Seychelles, these stamps were denominated in rupees until 1992. However, after that date they were issued in denominations of British Pounds, the official currency of the territory.

Separate telephone facilities for military and public needs are available, providing all standard commercial telephone services, including connection to the Internet. International telephone service is carried via satellite.

Cable & Wireless started operating in 1982 under licence from the British Government to provide international public telecommunications services on the island of Diego Garcia. In April 2013, the company was acquired by the Batelco Group, a telecommunications provider that now operates in 16 markets spanning the Middle East & Northern Africa, Europe, the South Atlantic and the Indian Ocean. As of 19 August 2013 Cable & Wireless (Diego Garcia) Limited changed name to Sure (Diego Garcia) Limited. Sure International is the corporate division of the business,

Services offered include international telephone, broadband internet and WiFi, GSM mobile, paging services and TV rebroadcast services. Telephone and internet services are also offered to maritime customers as well as an extensive portfolio of services to business and Government customers.

The territory has three FM radio broadcast stations provided by American Forces Network and British Forces Broadcasting Service. Due to its geographic location in proximity to the equator with unobstructed views to the horizon, Diego Garcia has access to a relatively large number of geosynchronous satellites over the Indian and eastern Atlantic Oceans, and the island is home to Diego Garcia Station (DGS), a remote tracking station making up part of the Air Force Satellite Control Network. Diego Garcia Station has two sides to provide enhanced tracking capabilities for AFSCN users.

Amateur radio operations occur from Diego Garcia, using the British callsign prefix VQ9. An amateur club station, VQ9X, was sponsored by the US Navy for use by operators both licensed in their home country and possessing a VQ9 callsign issued by the local British Indian Ocean Territory representative.[44] However, the US Navy closed the station in early 2013, hence any future licensed amateurs wishing to operate from the island will have to provide their own antenna and radio equipment.[45]

See also

  • Wenban-Smith, N. and Carter, M., Chagos: A History, Exploration, Exploitation, Expulsion Published by Chagos Conservation Trust, London (2016), ISBN 978-0-9954596-0-1


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  33. "HA08, British Indian Ocean Territory (BIOT) Chagos Archipelago, United Kingdom". Comprehensive Nuclear-Test-Ban Treaty Organization. Retrieved 5 April 2013.
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  36. Morris, Ted. "Diego Garcia – The Plantation".
  37. Owen Bowcott, Sam Jones (19 March 2015). "UN ruling raises hope of return for exiled Chagos islanders". The Guardian. Retrieved 29 March 2015.
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  44. Arneson, Larry (VQ9LA). "VQ9X Club Station". QSL.NET. Retrieved 20 September 2013.
  45. Arneson, Larry (VQ9LA). "(Post of) May 24, 2013". Official VQ9X Facebook page. Retrieved 20 September 2013.
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