Chao Phraya River basin

The Chao Phraya River is the principal river of Thailand, flowing south for over 225 miles to the Gulf of Thailand. Its basin, covering 61,807 square miles, is crucial for agriculture, particularly rice cultivation, and is supported by major irrigation projects. The river's headwaters originate in the northern mountains, with its main course beginning at the confluence of the Ping and Nan rivers. Historically, it has been a vital waterway for transportation and remains a source of water for drainage, recreation, and fishing. Many of Thailand's past and present capitals, including Bangkok, are situated on its banks or those of its tributaries. The Chao Phraya system is one of Thailand's two major river systems, the other being the Mekong in the east.12