Mount Douglas, a dissected and largely ice-covered, 2140-m-high stratovolcano at the northern tip of the Alaska Peninsula, is viewed here from the north. The volcano contains a youthful-looking, fumarolically active summit crater filled by a warm, acidic lake, but the presence of Holocene lava flows or tephra deposits has not been confirmed. Photo by Chris Nye (Alaska Division of Geological and Geophysical Surveys, Alaska Volcano Observatory).