Ping River is an important river of Thailand. And is a major Likewise , Kamphaeng Phet Province And one of two rivers that converge into a river. Ping river flowing in the valley between the hills and the Thanon Thongchai mountain ghost fable West. There headwaters of Doi Chiang Dao in Chiang Dao district . Flows south through Lamphun. Combined with the Wang River flows south through the Ban Tak , Tak , Kamphaeng Phet Province . To the confluence with the Nan River Sawan district Nakhon Sawan And from this point to the origin of the river . Ping River has a total length of 658 kilometers.