Phu Phan Mountains

The Phu Phan mountains (Thai: ทิวเขาภูพาน, RTGS: Thio Khao Phu Phan, pronounced [tʰīw kʰǎw pʰūː pʰāːn]; Northeastern Thai: ทิวเขาภูพาน, pronounced [tʰîw kʰǎw pʰûː pʰâːn]) are a range of hills dividing the Khorat Plateau of the Isan region of Thailand into two basins: the northern Sakhon Nakhon Basin, and the southern Khorat Basin. The silhouette of the Phu Phan Mountains appears in the provincial seal of Kalasin since they form the northern boundary of the province.

The Phu Phan mountains are among the places in Thailand more severely affected by the Illegal logging of Phayung (Siamese Rosewood) trees. Although officially a protected tree, the cutting and trading of the endangered rosewood trees has been going unabated in Thailand's mountainous forested zones, even in the protected areas.