National Parks and Monuments
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2007
...boating. Glen Canyon RA Ariz., Utah 1958 1,254,306 (507,816) Lake Powell, formed by the Glen Canyon Dam . Golden Gate RA W Calif. 1972 73,688 (29,833) Beaches, forests, marshes, San Franciscos Presidio, and Alcatraz Island. One of the...