Grand Canyon National Park is the United States' 15th oldest national park. Named a UNESCO World Heritage Site in 1979, the park is located in Arizona.
The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Seven Natural Wonders of the World. The park covers 1,217,262 acres (492,608 ha) of unincorporated area in Coconino and Mohave counties.
The Grand Canyon, including its extensive system of tributary canyons, is valued for its combination of size, depth, and exposed layers of colorful rocks dating back to Precambrian times. The canyon itself was created by the incision of the Colorado River and its tributaries after the Colorado Plateau was uplifted, causing the Colorado River system to develop along its present path.
The primary public areas of the park are the North and South Rims of the Grand Canyon itself. The rest of the park is extremely rugged and remote, although many places are accessible by pack trail and backcountry roads. Only the Navajo Bridge near Page connects the rims by road in Arizona; this journey can take around five hours by car. Otherwise, the two rims of the Canyon are connected via the Mike O'Callaghan–Pat Tillman Memorial Bridge and the Hoover Dam.
Source: Wikipedia
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