San Francisco is located on the West Coast of the
United States at the north end of the San Francisco Peninsula and includes
significant stretches of the Pacific Ocean and San Francisco Bay within its
boundaries. Several picturesque islands—Alcatraz, Treasure Island and the
adjacent Yerba Buena Island, and small portions of Alameda Island, Red Rock
Island, and Angel Island—are part of the city. Also included are the
uninhabited Farallon Islands, 27 miles (43 km) offshore in the Pacific
Ocean. The mainland within the city limits roughly forms a
"seven-by-seven-mile square," a common local
