Vesijärvi
Päijät-Häme, Finland
Nature
Vesijärvi is a lake of 111 square kilometres near Lahti in southern Finland. It suffered severe effects of eutrophication in the 1960s and a restoration programme began in the 1970s; by the start of the 2020s, the lake's water quality and ecosystem had significantly improved.
From Wikipedia, CC BY-SA 4.0
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