Onekotan is a volcanic island located near the northern end of the Kurils and is part of the Ring of Fire that encircles the Pacific Ocean. Onekotan island is unique because it has a water-filled caldera at both the northern and the southern ends of the island. The more prominent caldera at the southern end of the island has an island within the island and is known as the Tao-Rusyr Caldera. The highest elevation on Onekotan Island is Krenitsyn volcano which rises to 1325 meters above sea level. Possible species include Brown Dipper, Arctic Warbler, Japanese Robin, Pine Grosbeak and Japanese Grey Bunting.