Mae Sai River

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Mae Sai River
Mae Sai River26.JPG
View of the Mae Sai River swollen by the rainy season
Origin Daen Lao Range, Shan Hills
Mouth Ruak River SE of Tachileik Airport
20°27′52″N 99°57′17″E / 20.46444°N 99.95472°E / 20.46444; 99.95472Coordinates: 20°27′52″N 99°57′17″E / 20.46444°N 99.95472°E / 20.46444; 99.95472
Basin countries Myanmar and Thailand
Mouth elevation 380 m (1,250 ft)

Mae Sai River (Thai: แม่น้ำสาย, Northern Thai: Lanna-river-Sai.png, 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.[1]