Castle Crags is a dramatic and well-known rock formation in Northern California. Elevations range from 2,000 feet (610 m) along the Sacramento River near the base of the crags, to over 6,500 feet (2,000 m) at the summit of the tallest crag. Located just west of Interstate 5, between the towns of Castella and Dunsmuir, Castle Crags is today a popular tourist stop along the highway. The formation and surrounding habitats are protected by Castle Crags State Park, located on both sides of Interstate 5 at them, and by Castle Crags Wilderness Area of the Shasta-Trinity National Forest.