The Undivided Cachar district is a former administrative district of Assam that is largely congruous to Govinda Chandra's, the last king of the Kachari kingdom, domain in the Barak Valley. It has been divided into the present-day Cachar, Karimganj and Hailakandi districts in recent times.
References
Undivided Cachar district Wikipedia(Text) CC BY-SA