Deserts and Latitude: Not Just 30 Degrees

The idea that deserts cluster exactly at 30° latitude is an oversimplification. While the subtropical high-pressure belts (Hadley cell descent) around 30°N/S create many major deserts (Sahara, Arabian, Mojave, Atacama, Kalahari, Australian), deserts actually occur across a broader band—roughly 15° to 35° latitude—and beyond.

Key factors beyond latitude:

• Rain shadows: Andes create Atacama; Rockies create Great Basin; Himalayas create Gobi/Taklamakan.
• Cold currents: Benguela Current (Namib), Humboldt Current (Atacama), Canary Current (Sahara/Canaries) suppress rainfall.
• Continentality: Interior Asia (Gobi) far from moisture sources.
• Polar deserts: Antarctica and Arctic (cold deserts) receive minimal precipitation despite high latitudes.

So while the subtropical ridge is a major driver, desert distribution reflects a complex interplay of atmospheric circulation, topography, ocean currents, and distance from moisture sources—not a single latitude line.