Tao-Rusyr Caldera (Russian: Тао-Русыр) is a stratovolcano located at the southern end of Onekotan Island Kuril Islands Russia. It has 7.5 km wide caldera formed during a catastrophic eruption less than 10000 years ago (reported ages range from 5550 to 9400 Before Present). The waters of Kal’tsevoe Lake fill the caldera along with a large symmetrical andesitic cone Krenitsyn Peak that rises as an island within the lake.
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