Madrean Archipelago, Mountain ecoregion in southeastern Arizona and southwestern New Mexico, United States.
The Madrean Archipelago is a series of about 27 mountain ranges that rise from desert plains and create isolated woodland islands separated by open lowlands. These mountains reach between 3,000 and 10,000 feet in elevation and support distinct plant and animal communities in each range.
The mountains formed through geological processes that created these isolated ranges after the last ice age, separating them from the Sierra Madre Occidental. The distinctive pattern of separate peaks was shaped by volcanic activity and erosion over millions of years.
Indigenous peoples, Mexican herders, and American settlers developed distinct ways of living in these mountains for generations. Each group left marks on the landscape that visitors can still observe today through trails, old camps, and grazing patterns.
Multiple trailheads and access points are available through the Coronado National Forest and surrounding protected areas for exploring the region. The terrain can be challenging due to elevation changes and desert heat, so visitors should plan ahead and bring water.
The San Pedro River within this region contains more native vertebrate species than all of Yellowstone National Park combined. This small river creates a vital water source that supports an remarkable concentration of wildlife.
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