synclinal corridor

geology

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In Atlas Mountains: Transportation
…the plains, the nomads use synclinal corridors (i.e., corridors formed by folds in the rocks in which the strata dip inward from both sides toward the centre) that separate the ridges of the Saharan Atlas range. The Biskra Gap, situated between the Ouled-Naïl and Aurès ranges, provides a natural conduit…
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