Global Volcanism Program | Image GVP-00781
Active fumaroles on the SE crater wall of the highly acidic Kawah Ijen crater lake, within one of the cones that formed in the 20-km-wide Ijen caldera. The 1-km-wide turquoise-colored crater lake is near the eastern rim of Ijen caldera and has been the site of phreatic eruptions in historical time and is noted for its sulfur deposits.
Photo by Tom Casadevall, 1987 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.