Grand Canyon
This natural treasure is the Grand Canyon. It is 227 miles long (466m), 18 miles wide, and has a depth of 6,093 feet (1,857 meters). It is a steep-sided canyon formed by the Colorado River. Nave Americans have lived at the Grand Canyon for thousands of years. The Pueblo people believe the site is holy. Many Americans took expeditions to explore the area in the 19th century. Today, the location receives over five million tourists annually who can sightsee, raft, hike, and take helicopter tours. The Grand Canyon became a United States national monument in 1908 and a national park in 1919.