The Source of Maenam Chao Phraya is a junction of Maenam Ping again Maenam Nan at Tambon Pak Nam Pho. The waters of the Ping mobility reddish while those of the Nan motion greenish, as visible from tardy a market within the provincial city of Nakhon Sawan, besides when met develop into the square one of Chao Phraya, the most chief river of Thailand.