Contains 19 provinces, including Udon Thani Nong Bua lamphu Nong Khai, Nakhon phanom, kalasin, Sakon Nakhon, Mukdahan, usually a Khon Kaen, Chaiyaphum, Nakhon Ratchasima, mahasarakham, ROI et, yasothon amnat Charoen buri RAM, Surin, SI SA KET and Ubon Ratchathani. There is a terrain feature at a low plateau and slopes towards the South-East. There are mountains to the West, phetchabun and Dong Phaya Yen mountains is the region between the North and the central region. The southern part contains the mountains dividing the region San kamphaeng East and mountains bordering this semester, Dong Rak Gan salute to Cambodia. Phetchabun mountains Dong Phaya Yen mountains and which is about 800 to 1300 meters high mountain, 400 monks from Dong love meter is Southwest wind flow puts behind him, including the area to the West of the region with rain, less than East.
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