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Gila/Salt Intermediate Basins

Ecoregion in Sonoran Desert, AZ

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The Gila/Salt Intermediate Basins ecoregion is intermediate in elevation, climate, and natural vegetation between the Central Sonoran/Colorado Desert Basins (81j) and the higher Arizona Upland/Eastern Sonoran Basins (81l). These basins, mostly 900 to 1800 feet in elevation, contain the majority of the state’s human population and have permanently altered ecological features and processes. The region is the urban/agricultural core of south-central Arizona, dominated by urban, suburban, and cropland land covers and highly engineered hydrologic networks.

— EPA

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