The Grand Canyon is a steep canyon carved by the Colorado River in the U.S. the state of Arizona. It is largely in the Grand Canyon, one of the first national parks in the United States. President Theodore Roosevelt was one of the leading advocates of the preservation of the Grand Canyon area, visiting on numerous occasions to hunt and enjoy the scenery.
Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and reaches depths of over a mile (1.83 km) (6000 feet). Nearly two billion years of geologic history of Earth is revealed to the Colorado River and its tributaries cut channels through the rock layer by layer, when the Colorado Plateau was raised. But the specific timetable of the geological processes that formed the Grand Canyon in a discussion of geologists, recent studies demonstrate the Colorado River established its course through the canyon for at least 17 million years ago. Since then, the Colorado River has continued to erode, and a Canyon we see today.
Prior to European immigration, the Indians lived in the area who built settlements within the canyon and its many caves. Pueblo people considered the Grand Canyon ("Ongtupqa" Hopi language), the sacred site and made pilgrimages to it. The first European reportedly seen the Grand Canyon was García López de Cárdenas from Spain, who arrived in 1540.
