Naharkatia is a town and a Municipal board in Dibrugarh district in the Indian state of Assam. It is well known for petroleum and gas reserves. Earlier, Duliajan, the head office town of Oil India Limited was in its circle. However, the towns are close, within a 30-minute journey.

Dihing or Burhi Dihing is a large tributary, about 380 kilometres (240 mi) long, of the Brahmaputra River in Upper Assam in northeastern India. The river originates at 2,375 metres (7,792 ft) above sea level in the Eastern Himalayas in Arunachal Pradesh and flows through Tinsukia and Dibrugarh Districts in Assam to its confluence with the Brahmaputra at Dihingmukh. Its watershed covers about 6,000 square kilometres (2,300 sq mi). The Dihing has created number of oxbow lakes in the area.