3. the ping River.Where is the land of the mountains upstream Laos, Chiang Mai and Chiang DAO district to include with the Nan River at Nakhon sawan district?Total distance: 715 km
3. Ping upstream in the Dan Lao mountain ranges. Chiang Dao District, Chiang Mai Province and flow, combined with the Nan River, Mueang Nakhon Sawan a total distance of. : 715 kilometers.