Global Volcanism Program | Image GVP-00870
The SE-most pair of Kelimutu's crater lakes, Tiwu Ata Polo and Tiwu Nua Muri Kooh Tai, are seen here in an aerial view from the SE. A light-colored area of upwelling can be seen in the upper lake and this also occurs in the lower one. All three lakes are close to saturation with gypsum/anhydrite, contributing to color variations.
Photo by Tom Casadevall, (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.