Scattered mountains rise out of the vast Saharan Desert, creating this unique desert ecoregion. Barren gravel plains and stone plateaus surround the mountain ranges, as do wadis, or gullies, where drought-resistant umbrella thorn trees and athel pines grow. The West Saharan Mountains are an important stopover for migratory birds, including warblers, larks, wheatears, and swifts.
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