The northeast, located on the Tibetan Plateau. The Mekong river separates the north and east of the region by the south side to the Cambodian border. The Phetchabun mountains to the West. Dong phayayen along the mountains and separated from the NorthThe highest mountains in the East is the Phu kradung balance, which is a source of important river of the northeast, such as purpose. The Chi river moon river and northeast. With an area of approximately, 170000 square kilometers. The equivalent to one-third of the total area of Thailand. Which consists of various provinces than 20 provinces as follows.
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