Global Volcanism Program | Image GVP-00540
Clouds obscure the summit of Pusukbukit, a young volcano that formed on the western margin of Toba caldera. An active geothermal area forms the light-colored area at the base of the volcano across the strait from Samosir Island on Lake Toba.
Photo by Tom Casadevall, 1987 (U.S. Geological Survey)
This image is made available as a Public Domain Work, but proper attribution is appreciated.