Global Volcanism Program | Image GVP-02237
The 20 x 26 km Kussharo caldera, seen here from its western rim, is the largest of a cluster of calderas in NE Hokkaido. It formed around 30,000 years ago. Nakajima, a Holocene post-caldera lava dome complex, forms the large island to the left that fills much of the western half of the caldera. Atosanupuri is located near the center of the caldera, east of the lake.
Photo by Lee Siebert, 1977 (Smithsonian Institution).