MacCarthy Island, also known as Lemain Island or Janjanbureh Island, is an island located approximately 170 miles (272 km) upriver from the mouth of the Gambia River, in eastern Gambia, in the Central River Division. The town of Janjanbureh on the island is the second largest in the country, though it still appears on many maps by its European name of Georgetown. In addition to being a destination for some wildlife tourists, it is also the home of Gambia's largest prison.