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.
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The San Luis Mountains are a small, lower elevation mountain range of central-southern Pima County Arizona adjacent the U.S.-Mexico border, northeast of Sasabe, Arizona–Sasabe, Sonora.
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