Khon Kaen (Thai ขอนแก่น) is the second-largest of the north-eastern provinces (changwat) of Thailand. Neighboring provinces are (from north clockwise) Nongbua Lamphu, Udon Thani, Kalasin, Maha Sarakham, Buriram, Nakhon Ratchasima, Chaiyaphum, Phetchabun and Loei.
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