Semisopochnoi Island Volcano
- Estimate Date: 8,000 BCE
- Location: Alaska, United States
- VEI Rating: 6
These Alaskan volcanoes are something else. The Semisopochnoi Island feels like a place you’d see after a nuclear explosion wiped out life on the planet. It is uninhabited and does not contain ANY mammals. This works out well for many maritime birds that utilize the place for nesting as a result. The island is actually home to several volcanoes, including Mount Cerberus. The main volcano, the Semisopochnoi, is the largest subaerial volcano in the western Aleutians. It stands at a little over 12 miles wide above sea level while it contains a caldera that measures out at nearly 5 miles in width.