The mountain range that forms a natural barrier in Alaska is the Alaska Range. This range stretches approximately 650 miles and is home to North America's tallest peak, Denali, which rises to 20,310 feet. The Alaska Range plays a significant role in the state’s ecosystem, influencing weather patterns and providing habitats for various wildlife. It also attracts adventurers, climbers, and nature enthusiasts who seek to explore its rugged terrain and stunning landscapes.