Answer :
Sierra Madre Occidental is the primary mountain range in western Mexico that run around approximately parallel to the pacific coast.
What is Sierra Madre Occidental?
The Sierra Madre Occidental is defined as an important North American Cordillera mountain range system.
This range system crosses from the areas of the northwest to southeast areas through with northwestern and western Mexico, as well as along the Gulf of California.
Therefore, the main mountain range in western Mexico is Sierra Madre Occidental.
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