Onekotan
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Onekotan Island, located near the northern end of the Kuril Islands (), is another volcanic island that is part of the "Ring of Fire" that encircles the Pacific Ocean. The area of the island is 315 sq km. It is 42,5 km in length and 11-16,7 km wide. This island is unique because a water-filled caldera is evident at both the north and the south ends of the island. The more prominent caldera at the southern end of the island is known as the Tao-Rusyr Caldera. The highest elevation on Onekotan Island is Krenitsyn which is 1325 meters above sea level, that lies within the caldera. More recent secondary volcanic cones have formed in both calderas; the northern caldera has almost been filled by the subsidiary cone. Two other smaller volcanic peaks are also visible on this photograph - Makanrushi Island, 1170 meters, to the northwest of Onekotan Island and Kharimkotan Island, 1210 meters, to the south. Onekotan Island is separated from the neighboring islands by the Fourth Kuril Strait, Yevreinov Strait, and Krenitsyn Strait.
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