The Grand Canyon in Arizona is a steep-sided gorge carved by the Colorado River. The canyon is 277 miles (446 km) long, ranges in width from 4 to 18 miles (6.4 to 29 km) and attains a depth of over a mile (1.83 km) (6000 feet). The Grand Canyon is one of the Seven Natural Wonders of the World.
The canyon is unmatched throughout the world for the vistas it offers to visitors on the rim. It is not the deepest canyon in the world, (Kali Gandaki Gorge in Nepal is far deeper), nor the widest (Capertee Valley in Australia is about 1 km wider and longer than Grand Canyon) — but the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape. Geologically it is significant because of the thick sequence of ancient rocks that are beautifully preserved and exposed in the walls of the canyon. These rock layers record much of the early geologic history of the North American continent.