The beginning of the Chao Phraya River at Nakhon Sawan province. By the combination of Ping and the Nan river. The plain river area, 20125 square kilometers (not including basin, Ping Wang Nan Yom Sakae Krang pasak and tha Chin) [] and 1 long 372 kilometers. Divided into river at chainat
.The Chao Phraya River is a river of old in the Pleistocene. As one of main tributaries of river north Sunda contemporary with the MAE klong River and river pum Daung - TAPI later in the early Holocene. The increase from the melting of the ice.Because almost all the Chao Phraya River Basin under the Gulf. Then begin to siltation again as the Chao Phraya River at present.