Over 270 miles long, up to 18 miles wide and a mile deep, the Grand Canyon is known throughout the world for its overwhelming size and its intricate and colorful landscape. Located in northern Arizona, the majestic vista is geologically important because the layers of ancient rocks so beautifully preserved and exposed in the walls of the canyon reveal a timeline of Earth's history. Many pueblo and cliff-dweller ruins and archeological artifacts have been found in and around the Grand Canyon, the oldest of which are nearly 12,000 years old and date to the Paleo-Indian period, but there has been continuous use and occupation of the area since that time. Today, three Indian reservations—Navajo, Havasupai and Hualapai—adjoin Grand Canyon National Park. In the early 1800s, trappers and expeditions sent by the U.S. government began to explore and map the Southwest, including the canyon. Although first afforded Federal protection in 1893 as a Forest Reserve and later as a National Monument, the Grand Canyon did not achieve National Park status until 1919, three years after the creation of the National Park Service. Today Grand Canyon National Park encompasses more than 1 million acres of land and receives close to 5 million visitors each year.
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Grand Canyon. (2013). The History Channel website. Retrieved 12:29, December 13, 2013, from http://www.history.com/topics/grand-canyon.
Grand Canyon. [Internet]. 2013. The History Channel website. Available from: http://www.history.com/topics/grand-canyon [Accessed 13 Dec 2013].
“Grand Canyon.” 2013. The History Channel website. Dec 13 2013, 12:29 http://www.history.com/topics/grand-canyon.
“Grand Canyon,” The History Channel website, 2013, http://www.history.com/topics/grand-canyon [accessed Dec 13, 2013].
“Grand Canyon,” The History Channel website, http://www.history.com/topics/grand-canyon (accessed Dec 13, 2013).
Grand Canyon [Internet]. The History Channel website; 2013 [cited 2013 Dec 13] Available from: http://www.history.com/topics/grand-canyon.
Grand Canyon, http://www.history.com/topics/grand-canyon (last visited Dec 13, 2013).
Grand Canyon. The History Channel website. 2013. Available at: http://www.history.com/topics/grand-canyon. Accessed Dec 13, 2013.