Sonoran Desert wildlife

Mountains in the Sonoran Desert

The Sonoran Desert is a North American desert which straddles part of the border between the United States and Mexico and covers large parts of the states of Arizona, California and Sonora. It is one of the largest and hottest deserts in North America, with an area of 120,000 square miles (311,000 square kilometres). The desert contains a variety of unique plants and animals, such as the saguaro cactus.

The Sonoran Desert wraps around the northern end of the Gulf of California, from northeastern Baja California through southeastern California and southwestern Arizona to western Sonora. It is bounded on the west by the Peninsular Ranges, which separate it from the California chaparral and woodlands and Baja California desert ecoregions of the Pacific slope. To the north, the Sonoran Desert transitions to the cold-winter Mojave, Great Basin, and Colorado Plateau deserts. To the east, the deserts transition to the coniferous Arizona Mountains forests and Sierra Madre Occidental forests at higher elevations. The Sonoran-Sinaloan transition subtropical dry forest marks the transition from the Sonoran Desert to the tropical dry forests of Sinaloa.

The desert's subregions include the Colorado Desert and Yuma Desert . In the 1951 publication, Vegetation of the Sonoran Desert, Forrest Shreve divided the Sonoran Desert into seven regions according to characteristic vegetation: Lower Colorado Valley, Arizona Upland, Plains of Sonora, Foothills of Sonora, Central Gulf Coast, Vizcaino Region, and Magdalena Region. (see An Overview of the Sonoran Desert, external link below). Many ecologists now consider Shreve's Vizcaino and Magdalena regions, which lie on the western side of the Baja California Peninsula, to be a separate ecoregion, the Baja California desert.

External links

• Arizona-Sonora Desert Museum
• Timeline of the Sonoran desert
• An Overview of the Sonoran Desert, by William G. McGinnies

Links to Parks and Recreational Areas within the Sonora Desert

• Saguaro National Park Page
• Sonoran desert (World Wildlife Fund)