The Surma Valley which has reserves of mineral oil is located in :

The correct answer is Assam . Key Points Surma river is also called the Barak river. It is a major river that flows through northeastern India and eastern Bangladesh. The river originates in Manipur hills located in Manipur state and flows through Mizoram and Assam . The river splits into two branches Surma in the north and Kusiyara in the south. National Waterway 6 stretch is on this river.