The Kok River originates in Shan State, Burma. It flows down and across the
Burma-Thailand border to Mae Ai district, Chiang Mai Province. Most of its length is in
Chiang Rai Province passing the districts Mueang Chiang Rai, Mae Chan, Chiang Saen
and Wiang Chai. It becomes a tributary to the Mekong River in Chiang Saen district.
The Mali River (Mali Hka) is a river that originates in northern Burma. It flows
approximately 320 km, when it meets with the Nmai River and their confluence forms
the Irrawaddy River.