The State Park System includes 280 units, including parks, beaches, trails, wildlife areas, open spaces, off-highway vehicle areas, and historic sites. The State Park System is responsible for almost one-third of California's scenic coastline and manages coastal wetlands, estuaries, beaches, and dune systems. The State Park System consists of approximately 1.56 million acres, including: over 315 miles of coastline, 974 miles of lake, reservoir and river frontage, approximately 15,000 campsites and alternative camping facilities, and 4,249 miles of non-motorized trails. The facilities aid the Department's mission of providing for the health, inspiration and education of the people of California by helping to preserve the state's extraordinary biological diversity, protecting its most valued natural and cultural resources, and creating opportunities for high-quality outdoor recreation.