The mountain range that runs across the western United States is the Rocky Mountains, often simply referred to as the "Rockies." This expansive range stretches more than 3,000 miles from Canada through the United States to New Mexico. The Rockies are known for their stunning landscapes featuring rugged terrain, deep valleys, and alpine lakes. This region is a popular destination for outdoor activities such as hiking, skiing, and camping. The Rockies also play a critical role in the ecosystem and climate of the western U.S., influencing weather patterns and providing habitats for diverse wildlife.