Kalasin
has an area of 6,946 square kilometres. It
is divided into 18 districts (Amphoe): Mueang
Kalasin, Yang Talat, Kamalasai, Sahatsakhan,
Kuchi Narai, Tha Khantho, Somdet, Khao Wong,
Huai Mek, Kham Muang, Nong Kung Si, Na Mon,
Huai Phung, Rong Kham, Na Khu, Sam Chai, Don
Chan and Khong Chai.