With 18,661 square miles, Coconino is the second largest county in the United States and the largest in Arizona, but is one of the most sparsely populated. It is characterized by rugged mountains, deep canyons and thick forests of pine, spruce, pion, aspen and oak. Within its borders are many scenic sites the most popular and impressive is Grand Canyon National Park. Other attractions are Oak Creek Canyon, Sunset Crater National Monument, prehistoric Indian ruins at Wupatki, Walnut Canyon, the Navajo National Monument, the San Francisco Peaks, Arizonas highest point at 12,633 feet, and Lake Powell, with 1,960 miles of shoreline.