Arizona, a state in the United States' southwestern region, is best known for the Grand Canyon, a mile-deep gorge created by the Colorado River. Flagstaff, a ponderosa pine-covered mountain town, serves as a critical entrance to the Grand Canyon and is a popular tourist destination. Saguaro National Park, which protects a cactus-filled Sonoran Desert terrain, is another natural attraction worth seeing. Tucson is home to the Arizona-Sonora Desert Museum, which is located on the campus of the University of Arizona.
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