Muir Woods National Monument is a United States National Monument managed by the National Park Service and named after naturalist John Muir. It is located on Mount Tamalpais near the Pacific coast in southwestern Marin County, California. The Monument is part of the Golden Gate National Recreation Area, and is 12 miles north of San Francisco. It protects 554 acres, of which 240 acres are old growth coast redwood forests, one of a few such stands remaining in the San Francisco Bay Area.