7. Yellow River, China The yellow river which is also called the Huang He, is the second longest river in Asia and the sixth longest river in the world. It finds its origin in the Bayan Har mountains in Qinghai province of western China an empties into the Bohai sea near the city of Dongying in Shadong province. It's called “yellow” because of the muddy water arising from loess in the lower course of the river making it yellow. According to the report by UN Environmental Programme, 4.29 billion tons of industrial wastes and sewages was dumped in 1996, making one third of it unusable.