Mattru Jong commonly known as Mattru (sometimes spelled Matru) is the capital of Bonthe District in the Southern Province of Sierra Leone. Mattru Jung is located on the mainland of Bonthe District, along the Jong River, 52 miles southwest of Bo. The town is the seat of  Mongerewa Jong Chiefdom, and is the home of Mongerewa Jong Paramount Chief Alie Badara Sheriff III. The town's current estimated population is about 10,000 people. In 2010 it was 8,199, and in the 2004 census the town had a population of 7,647.