The prominent mountain range in the western United States is the Rocky Mountains, often simply referred to as the Rockies. This vast and rugged range extends from Canada down to New Mexico and is known for its breathtaking landscapes, including towering peaks, alpine lakes, and diverse ecosystems. The Rockies are a popular destination for outdoor activities such as hiking, skiing, and rock climbing. National parks like Rocky Mountain National Park showcase the area's natural beauty and attract millions of visitors each year.