Five Major U.S. Deserts: Mojave, Sonoran, Great Basin, Chihuahuan, and Colorado

The United States contains four major desert systems (plus a sub-region), each with distinct geography, climate, and ecology.

1. Mojave Desert

• Area: ~124,000 km² (smallest of the four).
• Location: SE California, S Nevada, NW Arizona, SW Utah.
• Climate: Hot summers (Death Valley: 56.7°C / 134°F record), cold winters. Rain shadow of Sierra Nevada.
• Iconic Species: Joshua tree (*Yucca brevifolia*), desert tortoise, creosote bush.
• Features: Death Valley, Kelso Dunes, Mojave National Preserve.

2. Sonoran Desert

• Area: ~260,000 km² (hottest US desert).
• Location: S Arizona, SE California, NW Mexico (Sonora, Baja).
• Climate: Bimodal rainfall (winter fronts + summer monsoon). Mild winters.
• Iconic Species: Saguaro cactus (*Carnegiea gigantea*), organ pipe, palo verde, Gila monster.
• Features: Saguaro NP, Organ Pipe Cactus NM, Pinacate Biosphere.

3. Great Basin Desert

• Area: ~492,000 km² (largest US desert).
• Location: Most of Nevada, W Utah, S Idaho, SE Oregon, E California.
• Climate: Cold desert—high elevation (1,200–2,000 m). Winter snow, summer heat. Rain shadow of Sierra/Cascades.
• Iconic Species: Sagebrush (*Artemisia tridentata*), juniper, pinyon pine, pronghorn.
• Features: Great Basin NP, Bonneville Salt Flats, Ruby Mountains.

4. Chihuahuan Desert

• Area: ~360,000 km² (2nd largest; mostly Mexico).
• Location: W Texas, S New Mexico, SE Arizona, N Mexico.
• Climate: Summer monsoon; >1,000 m elevation. Extreme diurnal swings.
• Iconic Species: Creosote, tarbush, lechuguilla, Mexican gold poppy.
• Features: Big Bend NP, White Sands NP, Carlsbad Caverns.

5. Colorado Desert (Sub-region of Sonoran)

• Area: ~18,000 km² (SE California, NE Baja).
• Climate: Lower elevation, hotter, drier than western Sonoran.
• Iconic Species: Ocotillo, creosote, palo verde, desert lily.
• Features: Anza-Borrego DSP, Salton Sea, Coachella Valley.

Together, these deserts cover ~20% of the US land area—vast, fragile, and biologically rich.