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The Songhua River Basin is the third largest river basin in the People’s Republic of China. Almost the entire northeast of the country lies within this basin. The Songhua is also one of the China’s four most polluted rivers, suffering until recently from untreated urban wastewater, industrial wastewater and agricultural non-point sources.
The Brantas basin in East Java supplies water to about 16 million users, but suffers from poor water quality due to rapid population growth and industrialization.
The lower part of the Dong Nai River supplies water to Ho Chi Minh City and Dong Nai and Binh Duong provinces and feeds a hydropower plant in the Tri An reservoir, but has been polluted by wastewater runoff from agriculture, aquaculture, industry and built-up areas (Ha et al. 2008).