Surin is one of Thailand's seventy-seven provinces (changwat). It lies in lower northeastern Thailand, also called Isan. Neighboring provinces are Buriram, Maha Sarakham, Roi Et, and Sisaket. To the south it borders Oddar Meancheay of Cambodia. Surin covers a total area of 8,124 km2 (3,137 sq mi) from the Mun River in the north to the Dangrek Mountains in the south. The capital, Surin city, in the western central region province is 434 km from Bangkok.