Tripura /ˈtrɪpərə/ is a state in Northeast India, and one of the Seven Sister States. The third-smallest state of India, it occupies an area of 4,051 sq mi (10,490 km2). Tripura is surrounded by Bangladesh on the north, south, and west. The Indian states of Assam and Mizoram lie to its east. The state capital is Agartala. A landlocked state, Tripura's geography is characterized by several north-south hill ranges with intervening valleys, and plain in the western part of the state.