Wow, growing up in India I always knew that the Mithi Nadi (ulhas) was incredibly polluted and trash filled. But, to see it at rank 3 is really eye opening.

There have been efforts over the last few decades to clean it up. But, Mumbai slums are situated on the river, and dump everything and anything into it. It would be nice to know if the Ulhas is mostly polluted with plastic upstream or at the mouth near Mumbai.