I guess that's what you'd expect from a river running through a forest: https://www.theguardian.com/commentisfree/2015/dec/07/london-forest-i-tree-study https:

I guess that's what you'd expect from a river running through a forest: https://www.theguardian.com/commentisfree/2015/dec/07/london-forest-i-tree-study https://www.theguardian.com/commentisfree/2015/dec/07/london...