. . . . "South Indian Plateau system.[7] In the south, the Barak originating in the Barail Range (Assam-Nagaland border), flows through the Cachar district with a 25???30 miles (40???50 km) wide valley and enters Bangladesh with the name Surma.Assam is endowed with petroleum, natural gas, coal, limestone and other minor minerals such as magnetic quartzite, kaolin, sillimanites, clay and feldspar.[8] A smal" .