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Arizona is located in the Western United States as one of the Four Corners states. Arizona is the sixth largest state in area, after New Mexico and before Nevada. Of the state's 118,000 square miles, approximately 15% is privately owned. The remaining area is government forest and park land, recreation areas and Native American reservations.

Arizona is best known for its desert landscape, which is rich in xerophyte plants such as cactus. It is also known for its climate, which presents exceptionally hot summers and mild winters. Less well known is the pine-covered high country of the Colorado Plateau in the north-central portion of the state, which contrasts with the desertic Basin and Range region in the southern portions of the state.

Like other states of the Southwest, Arizona has an abundance of topographical characteristics in addition to its desert climate. More than half of the state features mountains and plateaus and contains the largest stand of Ponderosa pine in the United States. The Mogollon Rim, a 2000-foot (600 m) escarpment, cuts across the central section of the state and marks the southwestern edge of the Colorado Plateau, where the state experienced its worst forest fire ever in 2002. Arizona belongs firmly within the Basin and Range region of North America. The region was shaped by prehistoric volcanism, followed by a cooling-off and related subsidence.

The Grand Canyon is a colorful, steep-sided gorge, carved by the Colorado River, in northern Arizona. The canyon is one of the seven natural wonders of the world and is largely contained in the Grand Canyon National Park—one of the first national parks in the United States. President Theodore Roosevelt was a major proponent of designating the Grand Canyon area, visiting on numerous occasions to hunt mountain lion and enjoy the scenery.