Nogales, Arizona and Nogales, Sonora lie at the eastern foothills of the range in the upper region of the north-south Santa Cruz River Valley, and in the I-17 corridor.
Rocky Mountains | Carpathian Mountains | Appalachian Mountains | Blue Ridge Mountains | Catskill Mountains | Ural Mountains | Snowy Mountains Scheme | San Gabriel Mountains | Black Mountains | San Bernardino Mountains | Ore Mountains | Jura Mountains | Caucasus Mountains | Tatra Mountains | Great Smoky Mountains | Apennine Mountains | Black Mountains, Wales | Atlas Mountains | Adirondack Mountains | Vosges Mountains | Troodos Mountains | Taurus Mountains | Tangra Mountains | Pamir Mountains | mountains | Great Smoky Mountains National Park | Allegheny Mountains | Cantabrian Mountains | Bakossi Mountains | Tehachapi Mountains |
Two mountain ranges, the San Luis in the southwest, and the Cerro Colorado Mountains northwest lie west of the four-mountain sequence of the Tumacacori Highlands-(of adjacent western Santa Cruz County) of the Tumacacori, Atascosa, Pajarito, and the Sierra La Esmeralda mountain ranges.