'kharnai' means pond. Every Dimasa household has a pond in their villages in the Barak Valley, which is used for domestic purposes, and also for beautification with lotus flowers.
Hawarma is famous for its oral history of the royal tanks from the reigns of Raja Tamradhvaj Hasnu and Raja Krishna Chandra Hasnu in the 17th and 18th centuries. Presently, these tanks like Baro Hal and Padda Dighir Par have been converted to fisheries.