Dima Hasao district earlier called North Cachar Hills district, is an administrative district in the state of Assam, India. As of 2011, it is the least populous district of Assam.

West Karbi Anglong District falls under Karbi Anglong Autonomous Council under 6th schedule of the Constitution. It is formed out of the existing Karbi Anglong District of Assam in 2016.

Hamren is the headquarter of West Karbi Anglong District.

The Karbi Anglong District is situated in the central part of Assam, bounded by  the state of Nagaland and Golaghat district in east, Hojai district in  the west, Golaghat and Nagaon district in the north and Dima Hasao district and Nagaland in the south. its Administrative Headquarter is at Diphu. It is the largest district of Assam.