Saint Joseph Atoll is part of the Amirante Islands group, which are in the Outer Islands (Coralline Seychelles) coral archipelago of the Seychelles islands and nation. The atoll is located southwest of the granitic Inner Seychelles archipelago, with a distance of 248 km south of Victoria, Seychelles. History The atoll was discovered in 1770 by European sailors. Private atoll In 1960, The island became the property of a Seychellois family, who built a coconut plantation on the bigger St. Joseph island. Nature preserve In August 2012 it was revealed that the atoll was sold, together with D'Arros Island, for US$60 million, to be managed by the Save Our Seas Foundation. Geography Saint Joseph Atoll is located only east of the eastern part of D'Arros Island, but it is a separate geographical unit, separated by deep water of a wide channel, which is deeper than much of the Amirantes Bank. The land area of the Atoll occupies . The main Saint Joseph island is of crescent shaped, flat coral sand cay, long and with average wide, and nowhere higher than . The tree tops are about 24 m high. Coral reefs The Atoll stands on a detached patch coral reef similarly orientated, with maximum dimensions of and . Its total area is 22.53 km2, of which 11.74 km2 comprises the peripheral reef flat, 4.8 km2 the interior lagoon, and only 1.39 km2 the land area of all islets. Depths of 500 m are found only 1.5 km east of the reef edge, and of 1000 m one kilometer further east. Lagoon The lagoon is completely enclosed by the surrounding reef. At low water it drains over a narrow sill, Passe Lerein Fin, at its western end. The lagoon has a maximum depth of 6.4 m. Other soundings range from 2.1 to 3.7 m. The peripheral reefs, in addition to being exceptionally wide, are covered (except on the west side) with mobile sand. Inter-tidal sand sheets are encroaching on the margins of the lagoon on its windward side, which is marked for much of its extent by a discontinuous linear sandbar. There are no growing reefs in the lagoon. List of islets The atoll has 13 sandy islets: the three larger ones along the northeast and east shore, which are covered by coconut plantations, and the remaining ones in the south: Administration The island belongs to Outer Islands District. Demographics The atoll