Mae Sai River
|Mae Sai River|
View of the Mae Sai River swollen by the rainy season
|Origin||Daen Lao Range, Shan Hills|
|Mouth||Ruak River SE of Tachileik Airport
|Basin countries||Myanmar and Thailand|
|Mouth elevation||380 m (1,250 ft)|
Mae Sai River (Thai: แม่น้ำสาย, Northern Thai: , RTGS: Maenam Sai, Thai pronunciation: [mɛ̂ːnáːm sǎːj]) is a river that forms the natural border between Thailand and Myanmar at Tachileik and Mae Sai Districts. Mae Sai town, where the bridge crossing the international border is located, is named after this river. It is a tributary of the Ruak River, itself a tributary of the Mekong.
The Mae Sai river has its sources in the Daen Lao Range, in Shan State, Myanmar. Then it flows southeastwards, bending eastwards at the feet of the northern end of the Doi Nang Non ridge before flowing through the Tachileik/Mae Sai urban area, where the border-crossing bridge at the meeting point of Thailand Route 1 and National Highway 4 (Burma) passes over the river. Finally it flows northeastwards before joining the right side of the Ruak River, a tributary of the Mekong, less than 3 kilometres (2 mi) southeast of Tachileik Airport.
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