Basse Santa Su, usually known as Basse, is a town in the Gambia, lying on the south bank of the River Gambia. The easternmost town in the nation, it is known for its important market. As of 2009 it has an estimated population of 18 414. Coordinates: 13°19′N 14°13′W Country The Gambia Division Upper River Division District Fulladu East Population • Total 18 414