We have a 'red lake' in Romania that is fairly recent (river dammed by an earthquake in 1838). It looks just muddy to me. It may have been red when it formed du

We have a 'red lake' in Romania that is fairly recent (river dammed by an earthquake in 1838). It looks just muddy to me. It may have been red when it formed due to water with iron oxides or something. https://en.wikipedia.org/wiki/Red_Lake_(Romania) https://en.wikipedia.org/wiki/Red_Lake_(Romania)