Marble Canyon is a section along the canyon of the Colorado River from the Glen Canyon Dam at Lake Powell (Page, Arizona) to the confluence of the Little Colorado River. The Grand Canyon officially begins below this confluence. The key location in Marble Canyon is Lee's Ferry where river-runners launch their boats for excursions on the Colorado River. Some motorized sightseeing boat trips go up-river from Lee's Ferry to the bottom of the Glen Canyon Dam and return. Down-river trips start here and usually go for several days into the Grand Canyon before concluding at various points within the canyon.
Near Marble Canyon is the famous Navajo Bridge where US Highway 89A crosses the Colorado River. Travelers will find this route handy for going to and from the North Rim of the Grand Canyon and into southern Utah. Marble Canyon is the western boundary of the Navajo Nation (the largest Native American tribe in the U.S.).