Global Volcanism Program | Image GVP-01496
The summit of Kusatsu-Shiranesan contains three craters with the largest, Yugama, holding the turquoise lake shown here. Rafts of yellow sulfur float on the surface of the acidic lake. This 1977 view looks across the lake from the SW-most crater (Karagama) to the NE-most crater (Mizugama), located beyond the notch to the left. Small-to-moderate phreatic explosions have been recorded from all three craters since the 1800s.
Photo by Lee Siebert, 1977 (Smithsonian Institution).
This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.