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Alcatraz Island is an island located in the San Francisco Bay, 1.5 miles (2.4 km) offshore from San Francisco, California, United States. Often referred to as "The Rock", the small island served as a lighthouse, a military fortification, a military prison, and a Federal Bureau of Prisons federal prison until 1963. Later, in 1972, Alcatraz became a national recreation area and received landmarking designations in 1976 and 1986.
