Which is the dirtiest river in the world?

No wonder this river suffers so much. It is affected by various human activities as it really does play an important role in the lives of people living nearby. The river supplies them with water for farming, irrigation, industry and many other spheres as well. And for its generosity, the river gets tons of garbage and poisonous substances. Moreover, people just throw domestic garbage into the waters of their mother-river. Disgusting and shameful!