Arizona is a state in the United States located in the southwestern region. Arizona is otherwise known as the Grand Canyon State as this is the home of the Grand Canyon National Park, which is one of the 7 wonders of the natural world.The state is the 6th largest in terms of land area and the 15th most populous.rizona is famous for its large variety of geographical features. Noted for the desert climate in the southern half of the state, the state has an abundance of mountains and plateaus, deserts, rivers, and lakes. Arizona is also one of the country's Four Corner states.