Kalain is situated in a strategic location of the Cachar district of Assam, India. It is about 28.5 kilometres (17.7 mi) from the district headquarters, Silchar, and is called the Gateway to Barak Valley. There are three railway stations that connect Kalain smoothly to rest of the valley and the state of Assam; one at Hilara, one at Sukritipur. and one at Bihara