Muir Woods National Monument is a part of the National Park Service on the Pacific coast of southwestern Marin County, California, 12 miles (19 km) north of San Francisco and part of the Golden Gate National Recreation Area. It protects 559 acres (226 ha), of which 240 acres (97 ha) are old growth Coast Redwood (Sequoia sempervirens) forests, one of a few such stands remaining in the San Francisco Bay Area.
On January 9, 1908, President Theodore Roosevelt declared the land a national monument, the first to be created from land donated by a private individual. The original suggested name of the Monument was the Kent monument but Kent insisted the Monument be named after naturalist John Muir, whose environmental campaigns helped to establish the national park system. President Roosevelt agreed, writing back: "MY DEAR MR. KENT: By George! you are right." and, responding to some photographs of Muir Woods that Mr. Kent had sent him, "Those are awfully good photos."