The mountain chain running through the northwestern United States is the Cascade Range. This volcanic mountain range extends from northern California into Canada, featuring several prominent peaks, including Mount Rainier and Mount St. Helens. The Cascades are known for their dramatic scenery, diverse ecosystems, and geothermal activity. They also influence the climate of the surrounding areas, creating a rain shadow effect on the eastern side. The range is popular for outdoor activities such as hiking and skiing, attracting numerous visitors each year.