| The Grand Canyon is one of the seven natural wonders
of the world. The park covers 1,904 sq. miles (4,950 sq. km) in northern
Arizona; it is 277 miles long (446 km) and is cut by the Colorado River.
The gorge is a mile deep (1.6 km) and 18 miles wide (29 km) in some
places. Nearly two billion years of the earth’s history is revealed
in the layers of rock and the park preserves more than 2,700 archaeological
sites of Native Americans, who have lived there for at least 4,000
years. The South Rim has a climate typical of the arid Southwest while
the North Rim is 1,000 feet (305 m) higher and is cooler, wetter and
heavily forested. The hot and dry Inner Canyon can only be reached
by foot, mule or boat.
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