Karymsky, one of Kamchatka's most active volcanoes, is a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during a major explosive eruption about 7500 years ago. Much of the youthful cone, seen here from a volcanological field camp on the SW flank, is mantled by lava flows less than 200 years old. Frequent historical eruptions have produced long-term explosive activity with occasional lava flows from the summit crater. Photo by Nikolai Smelov, 1996 (courtesy of Vera Ponomareva, Institute of Volcanic Geology and Geochemistry, Petropavlovsk).