The Seychelles is an archipelago in the Indian Ocean, northeast of Madagascar, consisting of more than 100 islands of which 83 are named and 46 are permanently uninhabited. Mahé is the principal island comprising of 142 sq km, with the islands of Praslin, La Digue and Silhouette being the next important . Situated about 1,600 km off the east coast of Africa, Mahe extends 27 km north to south and 11 km east to west and has a coastline of 127 km.

The Seychelles Islands are the highest point of the Mascarene Ridge, an Indian Ocean ridge running in a generally north-south direction.