Mount St. Helens National Volcanic Monument is located in the state of Washington and was established to preserve the area affected by the 1980 volcanic eruption. The eruption dramatically altered the landscape, creating a large crater and reshaping the surrounding environment. The monument covers over 110,000 acres and offers visitors a chance to learn about volcanic activity and its effects on ecosystems. The monument features various trails, viewpoints, and educational centers, making it accessible for hiking and exploration. It is home to diverse wildlife and plant species that have gradually returned since the eruption. The site serves as a valuable resource for scientific research and public education about geology and ecology.