The
Ping River (, , ), along with the
Nan River, is one of the two main contributaries of
Chao Phraya River. It originates at Doi Thuai,
Daen Lao Range, in
Chiang Dao district,
Chiang Mai Province. After passing
Chiang Mai town, it flows though the provinces
Lamphun,
Tak, and
Kamphaeng Phet. At the confluence with the Nan River at
Nakhon Sawan (also named
Paknam Pho in Thai) it forms the Chao Phraya River.