Whiteside Marsh is located in Novato, California north of San Francisco on the site of the former Hamilton Air Force base, adjacent to the historic hangars. Before the air base, it was the homestead of Peter Whiteside, . It is a habitat of Rana draytonii (Red-Legged Frog), identifiable as the name implies by distinctive red markings on the legs, as well as the endangered California Least Tern.