The Grand Canyon has an average depth of 4,000 feet, according to the National Parks Service. At its lowest point, the canyon is 6,000 feet deep . At its widest, the canyon spans 18 miles across.

The Grand Canyon is the biggest canyon on earth: 277 miles long, 10 miles wide, and a mile deep. It contains some of the oldest exposed rock on earth, Precambrian Vishnu schist, formed 1.7 billion ...