It is a tributary of the Kok River, with its mouth near Sum Pratu in Mueang Chiang Rai District.

The Lao River originates in the Phi Pan Nam Range[2] and flows initially northwards across Wiang Pa Pao District and then northeastwards through the districts of Mae Suai, Mae Lao and Mueang Chiang Rai passing just south of Chiang Rai city.

Media related to Lao River (Thailand) at Wikimedia Commons

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