Rai terrain is high mountains in the northern continent (North Continental Highland) have high plains patchy in Mae Suai district. Wiang PA Pao and at a height of about 1 mountain area. 500 - 2,,000 meters above sea level. The flat part along the river basin in the middle of the important areas, namely, Phan District, city, MAE Chan Sai, Chiang Saen and Khong, with a height of about 410 - 580 meters. From the sea.
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