The abbreviation for Arizona is AZ. Arizona is a southwestern U.S. state which is best known for the Grand Canyon, the mile-deep chasm carved by the Colorado River. Flagstaff, a ponderosa pine–covered mountain town, is a major gateway to the Grand Canyon. Other natural sites include Saguaro National Park, protecting cactus-filled Sonoran Desert landscape.
Tucson is University of Arizona territory and home to the Arizona-Sonora Desert Museum. It is also part of the Western and the Mountain states. It is the sixth largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix.