page_title: River systems of Thailand
section_title: Chao Phraya River system
hierarchical_section_title: River systems of Thailand / Chao Phraya River system
caption_attribution_description: English: The Chao Phraya River in Bangkok, Thailand.日本語: バンコク都内を流れるチャオプラヤ川。
context_page_description: Thailand has 25 river basins with 254 sub-basins. Rainwater is one of the most important sources of water. Thailand's water resoukle per capita is less than that of other countries in the region.
  The two principal river systems of Thailand are the Chao Phraya and the Mekong. Together, these rivers support the irrigation for Thailand's agricultural economy.
  In addition to these two large systems, there are a number of other river systems and individual rivers which drain the lands within Thailand's borders into the Gulf of Thailand and the Andaman Sea. One-third of the nation's rivers flow into the Mekong. The Mekong is the only river system in Thailand which drains into the South China Sea.
context_section_description: The Chao Phraya River system is the main river system of Thailand, as its basin defines much of the region of central Thailand. The Chao Phraya River begins at the confluence of the Ping and Nan Rivers at Nakhon Sawan (also called Pak Nam Pho) in Nakhon Sawan Province. It then flows from north to south for 372 kilometres (231 mi) from the central plains through Bangkok to the Gulf of Thailand. 
  In Chai Nat, the river splits into the main river course and the Tha Chin River, which then flows parallel to the main river and exits to the Gulf of Thailand about 35 kilometres (22 mi) west of Bangkok in Samut Sakhon. In the low alluvial plain which begins below the Chai Nat Dam, many small canals (khlong) split off from the main river. The khlong are used for the irrigation of the region's rice paddies.
caption: Chao Phraya River, Bangkok.
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