Sierra Madre Oriental, Mountain range in northeastern Mexico.
Sierra Madre Oriental is a mountain range in northeastern Mexico that runs through seven states, forming long ridges of folded limestone. Deep valleys and canyons separate the ridges, while vegetation shifts from dry western slopes to wetter eastern flanks.
The range formed about 60 million years ago when tectonic plates shifted and lifted marine sediments into folds. Later volcanic events reshaped parts of the chain and created mineral veins that were mined in later centuries.
Villages cling to steep slopes on the inhabited side of the range, where life adapts to altitude and limited flat ground. Residents use different vegetation zones for crops and grazing, shifting their activities as the elevation changes.
Access comes from roads leading in from cities on the western side, with many routes taking steep curves through passes. The best time to explore is outside the rainy season, when gravel and mountain roads stay passable.
At the Texas border, the range connects with the Rocky Mountains and forms part of the American Cordillera system. This link explains similar rock layers and erosion patterns found on both sides of the border.
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