Sherbro Island is in the Atlantic Ocean, located in Bonthe District off the Southern Province of Sierra Leone. The Sherbro people make up by far the largest ethnic group in the island.

The island is separated from the African mainland by the Sherbro River in the north and the Sherbro Strait in the east. It is 32 miles (51 km) long and up to 15 miles (24 km) wide, covering an area of approximately 230 square miles (600 km). The western extremity is Cape St. Ann. Bonthe, on the eastern end, is the chief port and commercial centre.