They look like balmy lagoons you could just dive right into, but this cluster of lakes is actually volcanic, the water whirling with sulfur. Found atop Mount Kelimutu on the island of Flores, Indonesia, three crater lakes each have different, changing colors, creating an effect like giant magical mood rings.
Keli means “lake” and Mutu means “boiling,” so swimming is definitely off the cards, but the spectacle of the multicolored craters is one of Indonesia’s most extraordinary sights and attracts thousands of tourists. According to volcano and earthquake data source VolcanoDiscovery, when a Dutch visitor fell into one of the lakes in 1995 and a five-day rescue effort ensued, measurements were taken and the temperature read 37 degrees Celsius, while surface bubbling was observed.
