It is a 2 km (1 mi) long and flat island with a maximum width of 400 m (1,312 ft), covered with tall coconut trees. Its name in all likelihood derives from the lack of a safe anchorage, which rendered every visit to this island dangerous for the ship and crew. The closest land is Île Vache Marine, the southernmost of the Eagle Islands which lies 16 km (10 mi) to the NNE.
There was never a permanent settlement on Danger Island, even at the time that the Chagos were inhabited (between the mid-18th and mid-20th centuries). However, occasionally plantation workers from other islands would be brought to this island to collect coconuts.
In 1975 there was an expedition to Danger Island by the Joint Services (JSDI). The expedition members were taken by RFA Resurgent to Eagle Islands and then by ketch and inflatable craft to Danger Island and to Three Brothers. The expedition made a topographical survey of the coral reef, an ecological survey of the corals on it and a study on the metabolism of the reef. A reference collection of samples of the flora and fauna of the area was also undertaken.
Danger Island has also been identified as an Important Bird Area by BirdLife International. Birds for which the island is of conservation significance include red-footed boobies (3,500 breeding pairs) and brown noddies (11,000 pairs).
- Indian Ocean Pilot
- British Admiralty nautical chart 11000030 - 3 Chagos Archipelago, Scale 1:360 000
- Baldwin, EA (ed.) (1975), A report on the Joint Services Expedition to Danger Island in the central Indian Ocean, December 1974 to April 1975 Ministry of Defence Publication, London
- Chagos Islands coral collections
- 6: British Indian Ocean Territory
- "Danger Island, Chagos Bank". Important Bird Areas factsheet. BirdLife International. 2012. Retrieved 2012-10-21.
- Joint Services Expedition To Danger Island - (1975) commemorative postcard
- Chagos research papers and books
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