“Kelimutu is a small, but well-known volcano in central Flores...

“Kelimutu is a small, but well-known volcano in central Flores Island of  Indonesia, close to the small town of Moni about 50 km to the east of Ende. At the summit of the volcano there are three crater lakes of varying colors. Although they share the crest of the same volcano and are practically side-by-side, the lakes periodically change colors from red and brown to turquoise and green, independent of each other.

It is believed that the lakes change colors as a result of chemical reactions resulting from the minerals contained in the lake perhaps triggered by volcano gas activity.” [Amusing Planet]

Image source: Mesmerize Journeys, Behan, Dylan Pollock, placestoseeinyourlifetime