The Han River or Hangang is a major river in South Korea and the fourth longest river on the Korean peninsula. The river serves as a major water source for Koreans despite significant industrial pollution, making it of concern to researchers, industry and the environmental regulatory community 

The Han River begins as two smaller rivers in the eastern mountains of the Korean peninsula, which then converge near Seoul, the capital of the country. The Han River and its surrounding area have played an important role in Korean history. The Three Kingdoms of Korea strove to take control of this land, where the river was used as a trade route to China (via the Yellow Sea). However, the river is no longer actively used for navigation, because its estuary is located at the borders of the two Koreas, barred for entrance by any civilians. 

The river serves as a water source for over 12 million Koreans. In July 2000, the US military admitted to having dumped toxic chemicals in the river; causing protests. In 2015, 25 companies were caught releasing wastewater polluted with hazardous chemicals into the Han River. The Seoul city government suspected the firms discharged nearly 3,000 tons of wastewater poisoned with potassium cyanide, chromium, lead, copper and phenol, all of which should be tightly regulated for its potential health risks. 

(Source Wikipedia and Korea Times) 

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