Three of the seven supervolcanoes are located in the continental US: Yellowstone, the Long Valley Caldera, and the Valles Caldera. The most well known supervolcano is in Yellowstone National Park, Wyoming (shown above).

The United States is home to three active (though currently dormant) supervolcanoes, each capable of a "VEI-8" eruption. The most famous is the Yellowstone Caldera in Wyoming, which has had three massive eruptions over the last 2.1 million years and powers the park's famous geysers. The second is the Long Valley Caldera in California, located near Mammoth Lakes; it was formed 760,000 years ago in a massive eruption that covered much of the Western U.S. in ash. The third is Valles Caldera in New Mexico, situated in the Jemez Mountains; it formed about 1.25 million years ago and is known for its beautiful high-altitude meadows. In 2026, these sites are closely monitored by the U.S. Geological Survey (USGS) using satellite and seismic sensors. While the term "supervolcano" sounds terrifying, scientists emphasize that none of these systems show any signs of an imminent eruption in our lifetime, and they primarily serve as stunning geological parks for hikers and researchers.