Approximately 17 million years ago, the Colorado River began carving its way through the Colorado Plateau, eroding the river’s sides and forming what we now know as the Grand Canyon. Today the canyon is 277 miles long and 18 miles wide at its widest point. The Colorado River lies at the bottom of the canyon, over 6,000 feet below the rim.
Grand Canyon National Park
The area surrounding the Grand Canyon was declared a National Monument in 1908 by President Theodore Roosevelt. Eleven years later the area was declared a national park, becoming one of the first national parks in the United States.
The National Park area covers 1,902 miles2 of Arizona and is included in both Coconino and Mohave counties. Stretching from Marble Canyon on the east to Pearce Ferry on the west, the park includes the entire north side of the canyon and the eastern half of the southern rim. The remaining portion of the south rim is part of the Hualapai Indian Reservation.
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