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 southern side of the lake is a playground and tennis court. A hiking trail that starts at Funston and Lake weaves along the southern side 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 northward, weaving around the wilder eastern and northern sides of the lake before going under