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Western Sonoran Mountain Woodland and Shrubland

Ecoregion in CA

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The Western Sonoran Mountain Woodland and Shrubland ecoregion, at the western edge of the Sonoran Desert, is a montane transition region that occurs generally above 3,000 feet in elevation, as one ascends into the Peninsular Range toward Ecoregion 8. It includes parts of the Santa Rosa Mountains in the north, several mountainous parts of the Anza-Borrego area, and parts of the In-Ko-Pah and Jacumba Mountains in the south. Among the granitic boulders, desert chaparral as well as singleleaf pinyon and California juniper occur. A few canyon live oaks occur near the western margin. In some steep canyons, native fan palm oases are found. These mountainous slopes provide habitat for a population of Peninsular bighorn sheep.

— EPA

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