Zion National Park is located in the Southwestern United States, near Springdale, Utah. A prominent feature of the 229-square-mile (590 km2) park is Zion Canyon, which is 15 miles (24 km) long and up to half a mile (800 m) deep, cut through the reddish and tan-colored Navajo Sandstone by the North Fork of the Virgin River.
Designated in 1919, Zion is Utah’s oldest national park.

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References:
http://www.nps.gov/zion/index.htm

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http://www.utah.com/nationalparks/zion.htm
https://en.wikipedia.org/wiki/Zion_National_Park