Phu Paan mountains
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The Phu Paan mountains 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 hills straddle the provinces of Nongbua Lamphu, Khon Kaen, Udon Thani, Sakon Nakhon, Nakhon Phanom and Kalasin.
The Phu Paan Royal Palace is located in the mountains, as is the Nam Oun Dam.