Level III Ecoregions of Arizona 115° 114° 113° 112° 111° 110° 109° .St

Level III Ecoregions of Arizona 115° 114° 113° 112° 111° 110° 109° .St. George Lake Powell COLORADO 37° UTAH 37° . PARIA . Fredonia

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Y E Fria L Y L E A L 34° V L 34° A V

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A W V N Wickenburg H R LE I E T L E K U S R M N C M TA I A O U N P M River White River River Quartzsite H Blythe . A r RQ . e U Sun City v A Theodore Salt H . Peoria Black i A . Roosevelt R L Lake A . Scottsdale P L Glendale . o A d IN a [Phoenix r Avondale. o Mesa l K . . Globe. o M O Tempe . OU FA C N . Apache TA Gilbert Junction IN . S Chandler San Carlos Reservoir 79 Gila .San Tan Valley Clifton. . Maricopa River Gila 33° . 33° Florence .Gila River Bend .Casa Grande G . 81 A L Safford 24 I Gila River U . Eloy P San . R IN O AL BAJA E Yuma Ñ

M O CALIFORNIA M O

Somerton Santa O H M U . A N YUMA O T W A U Simon DESERT K Cruz IN V N S . A T San Luis L A L I . N EY River S San Luis Oro. Rio Colorado SONORA . . Valley Ajo Marana Y E River L . L A San Willcox V . Tucson A O T O Willcox C J H I I Level III ecoregion Playa R U S I C 32° 32° Q U Y A International boundary L H E Benson. Pedro P L 79 U H L Green A State boundary A U M S V Valley R O N . I Sonoita . U County boundary A T N

N S T A U Perennial stream P I

O N R R S M Golfo De Santa Clara I A N . Intermittent stream MEXICO I T R G

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B Vista . L D

A L R 30 20 10 0 30 60Miles B E A Y Y N E R L Bisbee E L B A

. V N 60 40 20 0 60Puerto 120Kilometers Douglas A . S Albers equal area projectionPeñasco . Nogales . . . . Naco Agua Prieta Standard parallels 33º N and 36º N Nogales 114° 113° 112° 111° 110° 109° Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and 14 Mojave Basin and Range PRINCIPAL AUTHORS: Glenn E. Griffith (USGS), quantity of environmental resources. They are designed to serve as a spatial framework for 20 Colorado Plateaus the research, assessment, management, and monitoring of ecosystems and ecosystem James M. Omernik (USGS), Colleen Burch Johnson 22 Arizona/New Mexico Plateau components. These general purpose regions are critical for structuring and implementing (Raytheon Corporation), and Dale S. Turner (TNC). ecosystem management strategies across federal agencies, state agencies, and This map is derived from a poster publication of Level 23 Arizona/New Mexico Mountains nongovernment organizations that are responsible for different types of resources within the III and IV ecoregions: 24 Chihuahuan Deserts same geographical areas. Compilation of this map is based on the premise that ecological regions can be identified through the analysis of patterns of biotic and abiotic phenomena, Griffith, G.E., Omernik, J.M., Johnson, C.B., and 79 Madrean Archipelago and both terrestrial and aquatic characteristics. These include geology, physiography, Turner, D.S., 2014, Ecoregions of Arizona (poster): U.S. vegetation, climate, soils, land use, wildlife, and hydrology. The Ecoregions of Arizona map Geological Survey Open-File Report 2014-1141, with map, 81 Sonoran Basin and Range was compiled at a scale of 1:250,000. The map was part of a collaborative project between scale 1:1,325,000, http://dx.doi.org/10.3133/ofr20141141. USGS, US EPA National Health and Environmental Effects Research Laboratory (Corvallis, Oregon), US EPA Region 9, USDA-NRCS, USDA-FS, Arizona state environment Additional ecoregion information is available at: and natural resource agencies, as well as with other collaborators and contributors. http://www.epa.gov/wed/pages/ecoregions.htm