SierraMadre Occidental

Sierra Madre Oc·ci·den·tal (ŏk'sĭ-dĕnʹtəl, ōk'sē-dĕn-tälʹ)

A mountain range of northwest Mexico running parallel to the Pacific coastline and adjoining the Mexican plateau. It extends for about 1,609 km (1,000 mi) southward from the border of Arizona.

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