“Kawah Putih (English: White Crater) is a striking crater lake and tourist spot in a volcanic crater about 50 km south of Bandung in West Java in Indonesia.
It is one of the two craters that make up Mount Patuha, an andesitic stratovolcano (a ‘composite’ volcano). Mt. Patuha is one of numerous volcanoes in Java. Kawah Putih crater lake itself represents a relatively stable volcanic system with no records of significant activity since around 1600.
The Kawah Putih site was opened to visitors in 1987. The lake is 2,430 meters above sea level so the local climate is often quite chilly. This makes a brisk change from the humidity of the north Java plain and the capital city of Jakarta.
A sizeable, highly acid lake which changes color from bluish to whitish green, or brown, depending on the concentration of sulfur and the temperature or the oxidation state.
The sand and rocks surrounding the lake have been also leached into whitish colors through interaction with the acidic lake waters (with possible mineral precipitation as well).”