World Rivers Day 2021: This day is celebrated every year on 26 September all over the world. This time it will be celebrated on Sunday 26 September 2021. The purpose of this day is to reduce the increasing water pollution in the rivers. Because river is an integral part of our life, on which animals, animals, trees and plants depend. In such a situation, if you want to know in detail about World River Day, then stay till the end of the post.