St Pierre Island is a raised reef island west of Providence Atoll and part of Farquhar Group, which belongs to the Outer Islands of the Seychelles. The island is located at 9°17′S 50°44′E, 35 km (19 nautical miles) west of Cerf Island of Providence Atoll, 704 km (380 nmi) from Mahé and 500 km (270 nmi) ENE of Aldabra.
The island is nearly circular, 1.6 km (1 mile) east-west by 1.4 km (0.87 mi) north-south, with a land area of 1.68 km² (0.65 sq mi). St. Pierre has a gently sloping seabed on the exposed southeastern coast and a steep drop off on the northwest, where the fringing reef is all but absent. It is uninhabited, and indeed in modern times all but uninhabitable. There is a derelict jetty and settlement on the north west shore, which is accessible by boat in the calmest weather only.