"It was filthy, and it stank terribly!" How Europe's dirtiest river was brought back to life...

A €5.5bn project has transformed the Emscher from ‘the sewer of the Ruhr’ to a place where nature is starting to flourish.


https://www.theguardian.com/environment/2025/jul/10/emscher-europe-dirtiest-river-nature-sewer-of-ruher