Maly Semyachik volcano with acidic lake
Maly Semyachik is a stratovolcano located in the eastern part of Kamchatka Peninsula, Russia. Three overlapping stratovolcanoes were constructed sequentially along a NE-SW line, with the youngest cone, Tseno-Semyachik, at the southwest end. A hot, acidic crater lake fills the historically active Troitsky Crater, which formed during a large explosive eruption of Ceno-Semiachik about 400 years ago.
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It looks alien!
That color does not look safe to swim in at all.