Kalasin, the land of Pong Lang music and the famous Phrae Wa cloth, is 519 kilometres from Bangkok. It is the site of the ancient city of Fa Daet Song Yang and one of the largest concentrations of dinosaur fossils in northeastern Thailand.

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.