The Grand Canyon is a steep-sided canyon carved by
the Colorado River in the United States in the state of Arizona. It is
contained within and managed by Grand Canyon National Park, the Hualapai Tribal
Nation, and the Havasupai Tribe. President Theodore Roosevelt was a major
proponent of preservation of the Grand Canyon area, and visited it on numerous
occasions to hunt and enjoy the scenery. It is considered one of the Seven
Natural Wonders of the World.
The Grand Canyon is 277 miles (446 km) long, up to 18
miles (29 km) wide and attains a depth of
