Brooks Island Regional Preserve includes both the 75-acre (30 ha) of Brooks Island above the low-tide line and 300 acres (120 ha) of the surrounding bay. The only public access to the island is via an East Bay Regional Park District naturalist tour. Brooks Island is a mostly flat strip of land extending from a round hill, named Jefferds Hill, which peaks at 160 ft (49 m) in San Francisco Bay, located just south of the Richmond Inner Harbor in Richmond, California.