The St Joseph Atoll, 250km southwest of Mahé on the eastern edge of the Amirantes Bank, comprises the islands St. Joseph, Fouquet, Ressource, Ile Varres, Petit Carcassaye, Grand Carcassaye, Benjamin, Banc Ferrari, Chien, Banc de Sable, Banc Cocos, Ile Paul and Pelican. St Joseph Island itself comprises a land area of 1000 acres and is the largest island in the group. The Atoll is situated in close physical proximity to D'Arros Island and the two have always shared a closely tied fortune.

It was also a coconut plantation and had other vegetation as well. The lagoon on Saint Joseph Atoll has a huge population of stingrays as well as giant blue mud crabs that live in the depths of the lagoon and rise to the flats at high tide. There is a large population of bonefish, grouper and lobster. Abundant colourful reef fish are also there. Oysters can be found in large quantities on the coral walls and in the weeds.

Frigate birds have a colony on the island and there are many blue herons, wimbrels, crested terns and plovers.