4. Karymsky (Russian: Карымская сопка ) is a stratovolcano on the Kamchatka Peninsula, Russia. It is the most active volcano of Kamchatka's eastern volcanic zone, a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during the early Holocene. Much of the cone is mantled by lava flows less than 200 years old .