| Sierra San Luis | |
|---|---|
 | |
| Dimensions | |
| Length | 20 mi (32 km) (N-S) |
| Width | 15 mi (24 km) E-W |
| Geography | |
| Country | Mexico |
| States | Sonora andChihuahua |
| Regions | Sonoran Desert andChihuahuan Desert |
| Municipalities | Agua Prieta andDouglas, Arizona |
| Range coordinates | 31°8′N108°56′W / 31.133°N 108.933°W /31.133; -108.933 |
| Borders on | Sierra del Tigre,U.S.-Mexico border andPeloncillo Mountains |
TheSierra San Luis range is a mountain range in northwestChihuahua, northeastSonora,Mexico at the northern region of theSierra Madre Occidental cordillera. The region containssky island mountain ranges, called theMadrean Sky Islands, some separated from the Sierra Madre Occidental proper, and occurring in the northeasternSonoran Desert, and extreme west-northwesternChihuahuan Desert. Many of the ranges occur in southeastArizona.
Most of Sierra San Luis is privately owned land. The mountain range and the range to the north, thePeloncillo Mountains of Hidalgo County, New Mexico, can be viewed from the west at theLeslie Canyon National Wildlife Refuge and theSan Bernardino National Wildlife Refuge.
TheRio Bavispe borders the southeast of Sierra San Luis and flows northwest around theSierra del Tigre range.
Sky islands often lead togeographic isolation; (thetepuis of north-northeasternSouth America). The Madrean Sky Islands are being studied for mammal movements, the cats especially,bobcats,mountain lions, etc.
An example study is forsnakes, the Animas ridge-nosed rattlesnake,Crotalus willardi obscurus. It is being studied in 3 sky island ranges:Animas Mountains, the Peloncillos, and Sierra San Luis.[1]
North American beavers once flourished in the area, but their numbers have dwindled in the past few years and have become more rare in the area.[2]
Fauna and flora:
Rio Bavispe Reserve & Sierra del Tigre
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