5. Mount Katmai Crater Lake – Alaska, USA
Mount Katmai, located within the Katmai National Park and Preserve on the Alaska Peninsula, in Alaska, USA, is a stratovolcano has a central lake-filled caldera which is about 4.5 by 3 km in area. It was formed during the Novarupta eruption in 1912. There are small glaciers that have formed on a bench in the caldera, beside the lake whose surface elevation reaches a maximum height of 1286 m.