Mae Sai (Thai: แม่สาย, pronounced [mɛ̂ː sǎːj]; Shan: မႄႈသၢႆ, pronounced [mɛ.sʰǎj]) is the northernmost district (amphoe) of Chiang Rai province in northern Thailand. The town of Mae Sai is a major border crossing between Thailand and Myanmar. Asian Highway Network AH2 (Thailand Route 1 or Phahonyothin Road) crosses the Mae Sai River to the town Tachileik in Myanmar.

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Mae Sai แม่สาย
District
Mae Sai Town
District location in Chiang Rai province
Mae Sai Location in Thailand
Coordinates: 20°25′41″N 99°53′1″E
Country	Thailand
Province	Chiang Rai
Seat	Mae Sai
Area
• Total	285.0 km2 (110.0 sq mi)
Population  (2005)
• Total	86,298
• Density	302.8/km2 (784/sq mi)
Time zone	UTC+7 (ICT)
Postal code	57130
Geocode	5709

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One-day passes for non-Burmese nationals crossing into Myanmar are issued at Myanmar customs in Tachileik. Passports are confiscated and a temporary travel permit is issued; the permit is exchanged for the traveler's passport upon crossing back into Thailand. (No longer available as of 2016.) Since the changes in Thai immigration policy since March 2016, crossing this border as a foreign national is highly depended on individual Thai customs officers, as they have discretion.

Mae Sai is 259 km (161 mi) north of Chiang Mai, 61 km (38 mi) north of Chiang Rai, and 850 km (528 mi) north of Bangkok.

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.

The minor district (king amphoe) Mae Sai was created on 1 March 1939, when the two tambons Mae Sai and Pong Pha were split off from Chiang Saen District.^[1] The area was upgraded to a full district on 1 May 1950.^[2]

The district is divided into eight subdistricts (tambons), which in turn are further subdivided into 92 villages (mubans). There are two subdistrict municipalities (thesaban tambons) in the district: Mai Sai itself covering parts of the tambons Mae Sai and Wiang Phang Kham, and Huai Khrai covering parts of tambon Huai Khrai. There are a further eight tambon administrative organizations (TAO).

The geocode 7 is not used.