According to The Guardian, the Citarum River in Indonesia is so polluted that before you see it, you will smell it.
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The Sarno, known as Sarnus to the Romans, is a stream that passes through Pompeii to the south of the Italian city of Naples. It is considered the most polluted river in Europe.
The Thames is considered to be the cleanest river in the world that flows through a major city. The Thames is home to 125 species of fish and more than 400 invertebrates. This is in spite of the fact that raw sewage is routinely pumped into the river during heavy rains.
Fish in the ThamesThere is an incredible 125 species of fish that have been found living amongst the animals in the Thames, and this includes species of conservation and commercial importance.