Muir Beach is located 16.5 miles (26.6 km) northwest of San Francisco in western Marin County, California, United States.
Located about 2 miles (3 km) from the entrance to Muir Woods National Monument, the beach is about 1000 feet (305 m) long and 200 feet (61 m) wide, with coarse sand and several large boulders. There is a parking lot at the beach, which is then accessible via a footbridge.