Mountain Lake Park is a San Francisco park in the Richmond District neighborhood, located north of the intersection of Lake and Funston. It was designed by engineer William Hammond Hall in the late 19th century, circa 1875. Hall also designed Golden Gate Park and was significantly influenced by Frederick Law Olmsted. Mountain Lake is a small body of water east of State Route 1 (Park Presidio Boulevard). On the south side of the lake is a playground and tennis court. A hiking trail that starts at Funston and Lake weaves along the south of the lake and then continues east along the southern edge of the Presidio. The trail forks at the southeast corner of the lake as the other trail turns north, weaving around the wilder east and north of the lake before going under Highway 1. The lake is at the southern tip of the Presidio of San Francisco and just south of the Presidio Golf Course. A variety of birds can be observed around the lake's water including California seagulls and ducks. The lake has even played home to an alligator that was abandoned in its waters. On the east and south sides of the lake, native plants have been planted.