Sherbro Island is in the Atlantic Ocean, and is included within Bonthe District, Southern Province, Sierra Leone. The island is separated from the African mainland by the Sherbro River in the north and 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 km2). The western extremity is Cape St. Ann. Bonthe, on the eastern end, is the chief port and commercial centre.