The Sonoran Desert is a hot desert and ecoregion in North America that covers the northwestern Mexican states of Sonora, Baja California, and Baja California Sur, as well as part of the Southwestern United States. It is the hottest desert in both Mexico and the United States. It has an area of 260,000 square kilometers.
Realm: Nearctic
Biome: Deserts and xeric shrublands
Bird species: 246
Mammal species: 120
Area: 222,998 km² (86,100 sq mi)
Countries: Mexico · United States
States: Arizona · California · Baja California · Baja California Sur · Sonora