Neighboring districts are (from the east clockwise) Chiang Saen, Mae Chan and Mae Fa Luang. To the north is Myanmar, separated by the Mae Sai River and the Ruak River. The westernmost part of the district is dominated by the hills of the Daen Lao Range, the most important one is the Doi Tung with the Wat Phra That Doi Tung temple on top. Doi Nang Non is another notable mountain in Mae Sai District.
History[edit]