"Kelimutu" is a volcano located in Indonesia, that has 3 different lakes with a special phenomenon that draws tourists from all over the world.
It is the only place on earth where each lake changes its color by "oxidation reduction" caused by volcanic gas input and rainfall.
the outcome is amazing, and the colors switch periodically between green-red-brown-torques every now and then.
Source:
https://en.wikipedia.org/wiki/Kelimutu
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