The Grand Canyon is a very colorful, steep-sided gorge, carved by the Colorado River, in northern Arizona, USA. The canyon appears on many versions of the Seven Natural Wonders of the World list, although none of these lists is by any means authoritative. It is largely contained within the Grand Canyon National Park — one of the first national parks in the United States. President Theodore Roosevelt was a major proponent of the Grand Canyon area, visiting on numerous occasions to hunt mountain lions and enjoy the scenery. Edit this section or read more