The Green: Green River, Utah, to The Confluence, through Labyrinth & Stillwater canyons, 120 miles. The Colorado: Loma, Colorado, to Lees Ferry, Arizona, through Horsethief, Ruby, Westwater, Cataract, and Glen canyons, 372 miles. Satellite view and a map of Lake Powell. Detailed illustrated geologic section by geologist R.J. Johnson. Mile-by-mile geologic and historic notes. 80 pages.