stream

A salmon makes its way upstream on the River Tyne in Hexham, as tens of thousands of the fish have been helped by a new fish pass in a once in a lifetime journey to spawn. PRESS ASSOCIATION Photo. Picture date: Tuesday October 18, 2016. Along with thousands of sea trout, the fish swim up from the sea so they can lay their eggs in the tributaries of the river. See PA story ENVIRONMENT Salmon. Photo credit should read: Owen Humphreys/PA Wire

Owen Humphreys/PA

A salmon makes its way upstream on the River Tyne in Hexham, as tens of thousands of the fish have been helped by a new fish pass in a once in a lifetime journey to spawn. Photo Owen Humphreys/PA 

An Afghan refugee girl washes a bed in a polluted stream, in a poor neighborhood on the outskirts of Islamabad, Pakistan, Tuesday, Sept. 30, 2014.

Muhammed Muheisen/AP

An Afghan refugee girl washes a bed in a polluted stream, in a poor neighborhood on the outskirts of Islamabad, Pakistan

Kindergartners drink waters near a poster to mark the World Water Day, which falls on March 22, on Cheonggye Stream in Seoul, South Korea, Thursday, March 20, 2014.

Ahn Young-joon/AP

Kindergartners drink waters near a poster to mark the World Water Day, which falls on March 22, on Cheonggye Stream in Seoul, South Korea.