Mae Sai town, where the bridge crossing the international border is located, is named after this river.

The 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 there is a sign marking the northernmost point of Thailand just east of the border-crossing bridge —at the meeting point of Thailand Route 1 and National Highway 4 (Burma)— over the river.

[citation needed] 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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