Lvinaya Past
"The rim of the dramatic 7 x 9 km Lvinaya Past (Lion's Jaw) caldera on southern Iturup Island drops to 50 m below sea level on the NW side. The volcano derives its name from a rock resembling a sleeping lion that breaches the surface at the center of the submerged caldera rim. A shallow 5-km-wide passageway on the NW side allows the Sea of Okhotsk into the caldera basin, whose floor is 550 m below sea level and lies almost 1 km below the caldera rim. The caldera, also referred to as Moikeshi, formed about 9400 years ago during one of the largest Holocene eruptions in the Kuril Islands. Thick dacitic pumice deposits from this eruption form the 50-60 m high Yuzhny (Southern) isthmus, which joins the three southernmost volcanoes on Iturup Island, Rokko, Lvinaya Past, and Berutarubesan."  -Smithsonian Volcano Archive
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