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The Chao Phraya

The Chao Phraya watershed constitutes several sub-basin watersheds, which contain the rivers Ping, Wang, Yom, and Nan to the north of the country. In addition to these, it also contains many smaller riverine watersheds such as the Tha Chin, Pasak and Lopburi Rivers.

Illustration showing the drainage area of the Chao Phraya watershed (Source:

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Land resources and use in the Chao Phraya watershed

Over 90 % of the area in the watershed is either used for agriculture or covered with forest. Agricultural land is generally concentrated in the southern sub-basins and the majority of forest cover oc


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