Arizona /ˌæ.ɹɪˈzoʊ.nə/ is a U.S. state located in the Southwestern United States. It is noted for its desert landscape, exceptionally hot summers and mild winters. Less well-known is the pine-covered high country in the north-central portion of the state, which contrasts with the lower deserts of the state.

Arizona is one of the Four Corners states. It borders New Mexico, Utah, Nevada, California, touches Colorado, and has a 389 mi (626 km) international border with the states of Sonora and Baja California in Mexico. Aside from the Grand Canyon, many other National Forests, Parks, Monuments, and Indian reservations are located in the state. Arizona was the 48th and last of the contiguous states admitted to the Union on February 14, 1912. Residents are called Arizonans.