1. Citarum River, Indonesia Citarum river flows through the Indonesian province of West Java. It plays an important role in serving people great way by supplying water for irrigation and agriculture, industry, fishery and also in the electricity production. There are three hydroelectric power plant dams installed in this river. Despite of being generous, it is filled with tons of harmful substances from the industrial and domestic wastes. According to recent reports, the level of mercury is 100 times more than the legal amount. This has resulted in the dying of the river in certain parts.