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.
Laguna Lake, the fourth-largest lake in Southeast Asia, lies in the provinces of Rizal and Laguna. Increased development within the basin has caused water quality to decline steeply.
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.
Chao Lake, the fifth largest in the People’s Republic of China, struggled to overcome one of the most serious eutrophication problems in the country caused by decades of pollution spurred by economic growth pressures.