Kelimutu is an active volcano near Moni in central Flores in Indonesia. At the top of Mount Kelimutu there are three crater lakes that have different colors. The colors of the lakes have changed drastically several times over the years. There is still no uniform scientific justification for this natural spectacle.

Local people believe that the lunar landscape of Kelimutu is a haven for the spirits. After that, the souls of the boys and girls live in the Tiwu Nuwa Muri Koo Fai, which changes color between turquoise, deep blue and white-green. The sinners wait in the In Tiwu Ata Polo. This lake changes color between red and dark red, but was also green or even white. The souls of the ancients rest in the Tiwu Ata Bupu. The now almost black lake was once dark blue, then light blue to white. The name Kelimutu itself means ‘keli’ = ‘mountain’ and ‘mutu’ = ‘boiling’ in the local language.