Tripura , State, northeastern India. Area: 4,049 sq mi (10,486 sq km). Population: (2011) 3,671,032. Capital: Agartala. It is bordered to the north, west, and south by Bangladesh and to the east by Mizoram and Assam states. It was an independent Hindu kingdom before it became part of the Mughal Empire in the 17th century. After 1808 it was ...