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Protected within Zion National Park's 229 square miles (593.1 km) is a spectacular cliff-and-canyon landscape and wilderness full of the unexpected including the world's largest arch, Kolob Arch, with a span that measures 310 feet (94.5 m). Wildlife such as mule deer, golden eagles and mountain lions also inhabit the park. Mukuntuweap National Monument proclaimed July 31, 1909; incorporated in Zion National Monument March 18, 1918; established as national park Nov. 19, 1919.