The small, but spectacular 2.5-km-wide Kaguyak caldera,seen here from the west, is filled by a lake that lies more than 550 m below the caldera rim. A post-caldera lava dome extends into the lake on the SW side and another dome forms a small island in the center of the lake. The caldera is unglaciated and the voluminous caldera-forming deposits have been radiocarbon dated at at 5800 years ago. A large pre-caldera lava dome forms the high point on the east caldera rim. The broad valley of Big River descends to Shelikof Strait at the upper right. Photo by Chris Nye, 1982 (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory).