- Bill Williams River and & "Lake", i.e. Alamo Lake State Park: next parallel drainage E-West, N of the Gila River.
- Colorado River–(Riparian) Env. See:Riparian
- Deserts:W&NW: Mojave Desert; S&SE: Sonoran Desert; local: E&SE, Tule Desert (Arizona)
- Ephemeral stream: needs definition for: minor mtn streams, and larger, lower elevation "rivers".
- Gila River, major E-W drainage, extending E to Phoenix, and on to New Mex. border.
- Gulf of California
- Madrean sky islands, of SE Ariz, -Tucson, Arizona, Nogales, Arizona
- for Mtn range: Sierra Madre Occidental-(W. Mexico)
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- Painted Rock Reservoir, Arizona: major "Lake" of Gila River, N of Tule Des., "E. Yuma County".
- Peninsular Ranges-(Baja California)
- Permanent–Non-migrational
- Reserva de la Biosfera el Pinacate y Gran Desierto de Altar, the Pinacate Volcanic Field, Sonora, Mexico
- SE Ariz Biome, with Sky islands
- Sierra Juárez and San Pedro Mártir pine-oak forests; Ecoregion definition of high mtns, Baja California
- Skylarking (birds)
- Terrestrial ecoregions; i.e. Sonoran Desert
- Tule Desert (Arizona)
- (Winter Range/Resident)
- (Summer Range/Resident)
- Yuma-San Luis, Mex.: the "SW-corner", also co-positional with SE Calif. border/Colorado R.
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