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. The Highlands are now part of a conservancy study of wild cat 'travel corridor' usage between mountains, the study called Cuatros Gatos-(Four Cats), for the mountain lions, bobcat, ocelot, and jaguar.