The Madrean Sky Islands

The Madrean Sky Islands of Arizona, Sonora, Chihuahua, and New Mexico are a set of around 45 high elevation mountains rising out of lowland valleys. They are known for they're diversity of life and life zones. This archipelago covers the territory between the mountain chains of the Sierra Madre and the Rocky Mountains. They also bridge the divide between sub-tropical and temperate vegetation. See this definitive paper on the Madrean Sky Islands.

Animas Mountains
2,597 meters
Animas Mountains
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Baboquivari Mountains
2,357 meters
Baboquivari Mountains
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Chiricahua Mountains
2,974 meters
Chiricahua Mountains
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Pinal Mountains
2,392 meters
Pinal Mountains, Arizona
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Pinaleño Mountains
3,267 meters
Pinaleño Mountains, Mount Graham
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Santa Ritas
2,881 meters
Santa Rita Mountains
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Sierra Aconchi
2,194 meters
Sierra Aconchi
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Sierra Chivato
2,190 meters
Sierra Chivato
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Sierra de los Ajos
2,620 meters
Sierra de los Ajos
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Sierra El Humo
1,650 meters
Sierra El Humo looking down north facing canyon
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Sierra Mazatán
1,550 meters
Sierra Mazatán with Brahea brandegii
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Sierra Pinito
2,230 meters
Sierra Pinito
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Tumacacori Highlands
1,957 meters
Tumacacori Highlands, Atascosa Mountains
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