Kelimutu Mountain (1,690 m amsl) is a volcano in district of Ende, Flores, that has three crater lakes on its top with three different colors. The first crater is Tiwu Ata Mbupu (Lake of the eldest spirit). The second is Tiwu Nua Muri Koo Fai (Lake of young people spirit) and the third is Tiwu Ata Polo (Lake of Bewitched or Enchanted Lake).
Tiwu ata polo crater sometimes in red blood color, Tiwu nua muri koo fai often in emerald green color and Tiwu ata mbupu often in white color. But their colors changes periodically and sometimes their color same each other. According to scientist its color changes is related to chemical content of salt, iron, sulfate, other minerals and volcanic gas pressure in the crater. Sunlight and seismic activity also play a role.
Local people believe Kelimutu is a sacred place of their ancestor village. It is in accordance with the name of Kelimutu, ‘keli’ means ‘mountain’, and ‘mutu’ means ‘gather’.
Kelimutu is a 5,356.3 hectare National Park; you can find endemic Garugiwa bird (Pachycephala nudigula) and endemic Uta Onga plant (Begonia kelimutuensis) and Turuwara plant (Rhododendron renschianum).