Lvinaya Past (Russian: Львиная Пасть, literally "Lion's Jaw") is a volcano located in the southern part of Iturup Island, Kuril Islands, Russia. 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 access of 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.

• http://en.wikipedia.org/wiki/Lvinaya Past