Kuntomintar is a Pleistocene andesitic stratovolcano that occupies the southern end of Shiashkotan Island in the central Kuriles. A central cone fills a 4-4.5 km caldera, whose rim is visible on the NE side. A second caldera on the west side is breached to the west. An Ainu village that reportedly was destroyed by an eruption in 1872 was later found to be located near Sinarka volcano (Gorshkov, 1970). The only known postglacial activity of Kuntomintar is continuous solfataric activity that originates near the east wall of the inner caldera and a nearby hot sulfur spring.