Kok

The Kok river is a tributary of the Mekong River that flows through the northern Thai provinces of Chiang Rai and Chiang Mai. The river originates in Myanmar's Shan State, in the Daen Lao Range. It runs eastward across the Myanmar–Thailand border, passing through Tha Ton, Thailand's border town. It runs into Chiang Mai Province's Mae Ai District. The river travels through Chiang Rai Province for the majority of its course, passing through Mueang Chiang Rai District before bending northeastwards and flowing through Mae Chan, Wiang Chai, and Chiang Saen districts.

The Fang and the Lao Rivers are the Kok River's main tributaries, with the latter's source in the Phi Pan Nam Range. As part of their Burma Special in October 2013, the cast and crew of the British television show Top Gear built a bridge over the Kok. The bridge was supposed to be erected over the River Kwai, but it was "accidentally" chosen over the River Fang, which feeds into the Kok. On March 9 and 16, 2014, the show aired in two parts.