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Sonoran Basin and Range

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Name	†	Color on Map	EPA Code‡
Western Sonoran Mountains	○		81a
Western Sonoran Mountain Woodland and Shrubland	○		81b
Western Sonoran Basins	○		81c
Sand Hills/Sand Dunes	○		81d
Upper Coachella Valley and Hills	○		81e
Imperial/Lower Coachella Valleys	○		81f
Lower Colorado/Lower Gila River Valleys	○		81g
Sonoran Playas	○		81h
Central Sonoran/Colorado Desert Mountains	○		81i
Central Sonoran/Colorado Desert Basins	○		81j
Arizona Upland/Eastern Sonoran Mountains	○		81k
Arizona Upland/Eastern Sonoran Basins	○		81l
Sonoran Lava Fields	○		81m
Gila/Salt Intermediate Basins	○		81n
Middle Gila/Salt River Floodplains	○		81o

† Status: ✓ = Complete ○ = Needs Image … = Incomplete ∅ = Stub Only

‡ This code refers to the US EPA's Level 4 ecoregion codes for the continental U.S., see here.

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↑About the Sonoran Basin and Range

The Sonoran Basin and Range is part of the Warm Deserts, and extends from the southeasternmost corner of California through much of southwestern Arizona, and, in Mexico, into southeastern Baja California, through much of Sonora and with a small discontinuous piece stretching into Sinaloa.

This region consists of large, flat areas and scattered low mountains. It is hotter than the regions to the north. Winter rainfall is highest in the west, driven by storms moving in from the ocean, whereas summer rainfall is highest in the east, resulting from more southerly storms pushed north and inland as part of the North American monsoon.

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↑References

1. Wiken, E., Griffith, G. "North American Terrestrial Ecoregions - Level III", Commission for Environmental Cooperation, (2011) Web.