British Indian Ocean Territory

The British Indian Ocean Territory (BIOT) is a British Overseas Territory of the United Kingdom situated in the Indian Ocean halfway between Tanzania and Indonesia. 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).[2] 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.[5]

British Indian Ocean Territory
Location of British Indian Ocean Territory
Sovereign stateUnited Kingdom
and settlement
Camp Justice
7°18′S 72°24′E / 7.300°S 72.400°E / -7.300; 72.400Coordinates: 7°18′S 72°24′E / 7.300°S 72.400°E / -7.300; 72.400
Official languagesEnglish
Ethnic groups
GovernmentDependency under a constitutional monarchy
• Monarch
Elizabeth II
Paul Candler
• Deputy Commissioner
Stephen Hilton
• Administrator
Kit Pyman
Government of the United Kingdom
• Minister
Nigel Adams MP
• Total
54,000 km2 (21,000 sq mi)
• Water (%)
• Land
60 km2
23 sq mi
• Non-permanent 2018 estimate
Increase c. 3,000 military personnel and contractors
• Permanent
• Density
50.0/km2 (129.5/sq mi)
Time zoneUTC+06
Driving sideright
Calling code+246

The only inhabitants are British and U.S. military personnel and associated contractors, who collectively number around 3,000 (2018 figures).[6] The forced removal of Chagossians from the Chagos Archipelago occurred between 1968 and 1973. The Chagossians, then numbering about 2,000 people, were expelled by the UK government to Mauritius and Seychelles in order to construct the military base. Today, the exiled Chagossians are still trying to return, saying that the forced expulsion and dispossession was unlawful, but the UK government has repeatedly denied them the right of return.[7][8] 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 then Crown Colony of Mauritius by the UK in 1965 to form the British Indian Ocean Territory. A February 2019 advisory opinion of the International Court of Justice called for the islands to be given to Mauritius. Since this, the United Nations General Assembly and the International Tribunal for the Law of the Sea have reached similar decisions.


Maldivian mariners knew the Chagos Islands well.[9] 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.

Early settlementEdit

The islands of Chagos Archipelago were charted by Vasco da Gama in the early 16th century, and then claimed in the 18th 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.[10] In 1810, Mauritius was captured by the United Kingdom, and France subsequently ceded the territory in the Treaty of Paris in 1814.

Formation of BIOTEdit

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.[11]

A few weeks after the decision to detach the Chagos Archipelago from Mauritius, the United Nations General Assembly passed Resolution 2066 on 16 December 1965, which stated its belief that this detachment of part of the colonial territory of Mauritius was against customary international law as recorded earlier in the Declaration on the Granting of Independence to Colonial Countries and Peoples of 14 December 1960. This stated that "Any attempt aimed at the partial or total disruption of the national unity and the territorial integrity of a country is incompatible with the purposes and principles of the Charter of the United Nations."[12][13] Largely because of the detachment of the islands, the International Court of Justice determined in 2019 that the decolonization of Mauritius was still not lawfully completed.[14]

Mauritius became an independent Commonwealth realm in March 1968 and subsequently became a republic, also within the Commonwealth, in March 1992.

On 23 June 1976, Aldabra, Farquhar and Desroches were returned to the Seychelles which became independent as a republic on 29 June 1976; the islands now form part of the Outer Islands district of the Seychelles. Subsequently, the territory has consisted only of the six main island groups comprising the Chagos Archipelago.

Forced depopulationEdit

In 1966, the UK 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.[15] 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.[16] 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.

During the 1980s,[year needed] 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.[17] The Seychelles also made a sovereignty claim on the islands.[18][when?]

The islanders, who now mainly reside in Mauritius and the Seychelles, have continually asserted their right to return to Diego Garcia, winning important legal victories in the High Court of England and Wales 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.[19]

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.[20] On 23 May 2007, this was confirmed by the Court of Appeal.[21] In a visit sponsored by the UK 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.[22] On 22 October 2008, the UK Government won an appeal to the House of Lords regarding the royal prerogative used to continue excluding the Chagossians from their homeland.[23][24]

According to a WikiLeaks disclosure document,[25] in a calculated move in 2009 to prevent Chagossians returning to their homeland, 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 and Commonwealth 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 proceedings before the European Court of Human Rights".[26] (That court's 2012 decision was not in favour of the Islanders anyway.)[27]

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 counsellor Richard Mills and British Foreign and Commonwealth Office official 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."[28] 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."[28] The cable (reference ID "09LONDON1156") was classified as confidential and "no foreigners", and leaked as part of the Cablegate cache.

Development of BIOTEdit

View of Diego Garcia, showing military base.

Work on the military base commenced in 1971, with a large airbase with several long range 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 UK maintains 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.

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.[29] The US-UK arrangement which established the territory for defence purposes initially was in place from 1966 to 2016, and has subsequently been renewed to continue until 2036. The announcement was accompanied by a pledge of £40 million in compensation to former residents.[30]

International rulingsEdit

On 22 May 2019, the United Nations General Assembly (UNGA) adopted a resolution, affirming that "the Chagos Archipelago forms an integral part of the territory of Mauritius", citing the February 2019 advisory opinion of the International Court of Justice (ICJ) on the separation of the archipelago from Mauritius.[31] In its advisory opinion, the Court concluded that “the process of decolonization of Mauritius was not lawfully completed when that country acceded to independence” and that “the United Kingdom is under an obligation to bring to an end its administration of the Chagos Archipelago as rapidly as possible”.[32] The motion was approved by a majority vote with 116 member states voting for and 6 against.[31] On 28 January 2021, the United Nation's International Tribunal for the Law of the Sea ruled, in a dispute between Mauritius and Maldives on their maritime boundary, that the United Kingdom has no sovereignty over the Chagos Archipelago, and that Mauritius is sovereign there. The United Kingdom disputes and does not recognise the tribunal's decision.[33][34]

The Universal Postal Union (UPU), which has jurisdiction over international mail among treaty signatory states, voted in 2021 to ban the use of British postage stamps on mail to and from BIOT, instead requiring Mauritian stamps to be used.[35]


Elizabeth II is the head of state of the British Indian Ocean Territory.

As a territory of the United Kingdom, the head of state is Queen Elizabeth II. There is no Governor appointed to represent the Queen in the territory, as there are no permanent inhabitants (as is also the case in South Georgia and the South Sandwich Islands and the British Antarctic Territory). The territory is one of eight dependencies in the Indian Ocean alongside the Ashmore and Cartier Islands, Christmas Island, the Cocos (Keeling) Islands, and Heard Island and McDonald Islands, all Australian possessions; the French Southern and Antarctic Lands, with the French Scattered Islands in the Indian Ocean and its dependencies of Tromelin and the Glorioso Islands; along with French Mayotte and Réunion.

The head of government is the Commissioner, currently Ben Merrick, who is also Director of Overseas Territories in the Foreign and Commonwealth Office and Commissioner of the British Antarctic Territory; the Deputy Commissioner is Stephen Hilton and the Administrator is Kit Pyman, and all senior officials reside in the United Kingdom. The Commissioner's Representative in the territory is the officer commanding the detachment of British forces.[36]

View of East Point, Diego Garcia, from the air.

The laws of the territory are based on the constitution, currently set out in the British Indian Ocean Territory (Constitution) Order 2004, which gives the Commissioner power to make laws for the peace, order and good government of the territory.[37][38][39] If the Commissioner has not made a law on a particular topic then, in most circumstances, the laws that apply in the territory are the same as those that apply in England and Wales under the terms of the Courts Ordinance 1983.[40] There is no legislature (and no elections) as there are no permanent inhabitants, although a small legal system has been established for the jurisdiction. As almost all residents of the BIOT are members of the United States military, however, 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 first exchange of notes, signed on 30 December 1966, constituted an agreement concerning the availability for defence purposes of the British Indian Ocean Territory.[41] This was followed by agreements on the construction of a communications facility (1972), naval support facility (1976), construction contracts (1987), and a monitoring facility (1999). The United States is reportedly required to ask permission[citation needed] of the United Kingdom to use the base for offensive military action.


The British Indian Ocean Territory prior to the Seychelles's independence in 1976. The land at bottom left is the northern tip of Madagascar. (Desroches is not labelled, but is a part of the Amirante Islands.)
Map of the British Indian Ocean Territory since 1976.

The territory is an archipelago of 55 islands,[38] the largest being Diego Garcia, the only inhabited island which accounts for almost half of the territory's total land area (60 km2). The terrain is flat and low, with most areas not exceeding 2 m (6 ft 7 in) above sea level. In 2010, 545,000 square kilometres (210,426 sq mi) of ocean around the islands was declared a marine reserve.[26]

The British Indian Ocean Territory (Constitution) Order 2004 defines the territory as comprising the following islands or groups of islands:

As indicated above, the territory also included Aldabra, Farquhar and Desroches between 1965 and 1976; the latter group of islands is located north of Madagascar and were annexed from and returned to the Seychelles.


The climate is tropical marine; hot, humid, and moderated by trade winds.[42]


In terms of transportation on Diego Garcia, the island has short stretches of paved road between the port and airfield and on its streets; transport is mostly by bicycle and on foot. 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.[43]

The airport passenger terminal in Diego Garcia

Diego Garcia's military base is home to the territory's only airport. At 3,000m long, the runway is capable of supporting heavy US Air Force bombers such as the B-52 and would have been able to support the Space Shuttle in the event of a mission abort.[44] It also has a major naval seaport [45] and there is also a marina bus service along the main road of the island.[46]

Yacht crews seeking safe passage across the Indian Ocean may apply for a mooring permit for the uninhabited Outer Islands (beyond Diego Garcia)[47] but must not approach within 3 nautical miles, land on or anchor at islands designated as Strict Nature Reserves or the nature reserve within the Peros Banhos atoll. Unauthorised vessels or persons are not permitted access to Diego Garcia and no unauthorised vessel is permitted to approach within 3 nautical miles of the island.[48]


Salomons Atoll

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 MPA 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 archipelago, to an eventual return of the archipelago, and to the preservation of any minerals or oil discovered in or near the archipelago prior to its return.[49][50]

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

  • Providing 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;
  • An opportunity for research related to marine science, biodiversity, and climate change;
  • Acting as a reserve for species in danger in other areas; and
  • Providing an export supply of surplus juveniles, larvae, seeds, and spores to help with output in neighbouring areas.[51]

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

The BIOT Administration has facilitated several visits to the territory by the eldest Chagossians, and environmental training for UK-based Chagossians that allows some to become involved in scientific work (alongside visiting scientists).[52]

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. 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 ship 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.[53]


The British Indian Ocean Territory (Constitution) Order 2004 states that "no person has the right of abode" in the territory as it "was constituted and is set aside to be available for the defence purposes of the Government of the United Kingdom and the Government of the United States of America" and accordingly "no person is entitled to enter or be present in the Territory except as authorised" by its laws.

As there is no permanent population, or census, information on the demographics of the territory is limited; the size of the population is related to its offensive requirements. Diego Garcia, with a land area of 27 km2, is the only inhabited island in the territory and therefore has an estimated average population density of around 110 persons per km2.

The island's population is limited to official visitors and military-essential personnel only, and family members are not authorised to travel to Diego Garcia (the island therefore has no schools). Personnel may not travel to the island for leave but they may transit through Diego Garcia to connect with follow-on flights.[54] The population in 1995 was estimated to be approximately 3,300 - i.e. 1,700 UK and US military personnel and 1,500 civilian contractors. The total population was reportedly 4,000 persons in 2006, of whom 2,200 were US military personnel or contractors, 1,400 were Overseas Filipino Worker contract staff, 300 were Mauritian contract staff, and 100 were members of the British Armed Forces.[citation needed] The population had decreased to around 3,000 persons in 2018.[2] United Nations population statistics indicate that island's population is comparable to that of the Falkland Islands. The remainder of the archipelago is ordinarily uninhabited.


A proportional representation of British Indian Ocean Territory exports, 2019
Street in Diego Garcia. Traffic drives on the right, unlike other British territories except for Gibraltar

All economic activity is concentrated on Diego Garcia, where joint UK/US defence facilities are located. Construction projects and the operation of various services needed to support the military installations are carried out by military and contract employees from Britain, Mauritius, the Philippines, and the USA. 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.[55]


The Navy Morale, Welfare and Recreation (MWR) section provides several facilities on Diego Garcia, including a library, outdoor cinema, shops and sports centres, with prices in US dollars. The BIOT Post Office provides outbound postal services and postage stamps have been issued for the 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 sterling, which is the official currency of the territory. Basic medical services are provided, with the option of evacuation where required, and the territory has no schools.[56]


Cable & Wireless started operating in 1982 under licence from the UK Government. In April 2013, the company was acquired by the Batelco Group and Cable & Wireless (Diego Garcia) Ltd subsequently changed its name to Sure (Diego Garcia) Ltd; Sure International is the corporate division of the business.

Due to its geographic location in proximity to the Equator with an 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 United States Space Force's Satellite Control Network (SCN); the station has two sides to provide enhanced tracking capabilities for AFSCN users.[57]


The territory has three FM radio broadcast stations provided by the American Forces Network and British Forces Broadcasting Service. 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.[58] However, the US Navy closed the station in early 2013 and any future licensed amateurs wishing to operate from the island would therefore have had to provide their own antenna and radio equipment.[59]

.io Domain NameEdit

The .io ("Indian Ocean") country-code top-level domain was delegated by the Internet Assigned Numbers Authority to British entrepreneur Paul Kane in 1997, and was operated for private benefit under the trade name "Internet Computer Bureau" from 1997 until 2017.[60] In April, 2017, Paul Kane sold the Internet Computer Bureau holding company to privately-held domain name registry services provider Afilias for $70.17m in cash.[61] In July 2021, the Chagos Refugees Group UK submitted a complaint to the Irish government against Paul Kane and Afilias, seeking repatriation of the .io domain and payment of back royalties from the $7m/year in revenue generated by the domain.[62]


See alsoEdit


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  5. ^ Chirayu Thakkar (12 Jul 2021) OVERCOMING THE DIEGO GARCIA STALEMATE
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  57. ^ "20th Space Control Squadron, Det 2". US Air Force. Retrieved 17 June 2020.
  58. ^ Arneson, Larry (VQ9LA). "VQ9X Club Station". QSL.NET. Retrieved 20 September 2013.
  59. ^ Arneson, Larry (VQ9LA). "(Post of) May 24, 2013". Official VQ9X Facebook page. Retrieved 20 September 2013.
  60. ^ Bridle, James. ".IO: British Indian Ocean Territory". Citizen Ex. Retrieved 2 August 2021.
  61. ^ Murphy, Kevin (9 November 2018). "Afilias bought .io for $70 million". Domain Incite. Retrieved 13 August 2020.
  62. ^ Levy, Jonathan. "COMPLAINT FILED AGAINST Afilias Ltd. (Ireland) including its subsidiaries 101domain GRS Limited (Ireland), Internet Computer Bureau Limited (England & British Indian Ocean Territory) In Respect of OECD Guidelines Violations in Operation of ccTLD .io BEFORE THE IRELAND OECD NATIONAL CONTACT POINT" (PDF). Chagos Refugees Group UK. Retrieved 2 August 2021.
  • 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

External linksEdit

Official websites

Chagossian campaign