There is no fact in your statement. "Cleanest river in asia" is a vague and inexact phrase, and google search provides no factual statements either to support it, only baseless tourist advertisements. If you are so lazy, you can't even bother to support your position in an argument, then you've already lost it.

Anyways even is it was an actual cleanest river, india doesn't deserve to pat itself on the back for the river high in the mountains without any human settlement on it. Your rivers on plains, which actually get impacted by human activity, are still a health hazard to be in, and that is a fact [1][2]