Mount St. Helens, known for its 1980 eruption, is located in Washington State.

Mount St. Helens is an active stratovolcano located in the Cascade Range of Washington State. It famously erupted on May 18, 1980, in one of the most catastrophic volcanic events in U.S. history, dramatically altering the landscape. The eruption resulted in a massive debris avalanche and the largest landslide ever recorded. Today, Mount St. Helens is a popular site for geological studies and outdoor activities such as hiking, with the Mount St. Helens National Volcanic Monument providing access to the area. The volcano remains an important landmark and a symbol of the dynamic geological forces in the Pacific Northwest.