Global Volcanism Program | Image GVP-01159
Hydrothermally altered rocks are exposed in the NW crater wall of Kawah Ijen in 1973. Rafts of yellow floating sulfur line the shore of the turquoise-colored crater lake. The walls of the 1.2-km-wide crater rise to more than 200 m above the surface of the lake, which has a maximum depth of 200 m.
Photo by Sumarma Hamidi, 1973 (Volcanological Survey of Indonesia).