Global Volcanism Program | Image GVP-00529
A crater containing a small turquoise-colored lake and active sulfur-coated fumaroles on the summit lava dome of Sibayak volcano. The volcano is considered to be the abode of Nini Kertah Ernala ("Grandmother of the Gleaming Sulfur"), the mountain's spirit.
Photo by Tom Casadevall, 1987 (U.S. Geological Survey).
This image is made available as a Public Domain Work, but proper attribution is appreciated.