Over thousands of years, the Colorado River has cut a canyon 1.6 kilometers deep, 446 kilometers long, and 29 kilometers wide. The Grand Canyon attracts about five million visitors every year. Visitor with strong legs can walk from the forests at the top to the desert basin near the bottom. Others can enjoy river trips on boats that go through the canyon. But most people drive to one or two areas at the top of the Grand Canyon and look out across one of the most beautiful places in the country.