Global Volcanism Program | Image GVP-01224
Tiwu Ata Mbupu is the NW-most of three craters on Kelimutu. It is 850 x 600 m wide and contains a 67-m-deep crater lake. The shoreline of the lake is coated with red/yellow minerals and gypsum crystals. Lake color tends to vary seasonally.
Photo by L.D. Reksowirogo, 1972 (Volcanological Survey of Indonesia).