The Grand Canyon

This canyon is a very deep river valley, and the Grand Canyon is created by the Colorado River in the State of Arizona, U.S. It is one of the Seven Natural Wonders of the World. The Grand Canyon is 277 miles long and 18 miles wide. At some places it is one mile deep. There have been different opinions about the formation of the canyon, but recently the geologists have arrived at the conclusion that the Colorado River started flowing into the canyon about 17 million years ago. The river continued cutting its course, layer by layer, and this continuous corrosion is the cause of its extraordinary depth.