Kalasin is 519 kilometers from Bangkok and administratively divided into 18 districts, an occupying are of 7,055.07 square kilometers. The characteristics of the area are mountainous along the Phuphan Range in the upper part while the middle part is hilly area with the alteration of deciduous forest.
Kalasin is one of the most fertile provinces in the northeastern region. According to archaeological evidence, it points that the area was once inhabited by the Lawa tribe, whose civilization dates back to about 1,600 years ago. The historical evidence points out that the city was first established during the Rattanakosin period in 1793.