Western Cordillera

An area that covers an extensive area of mountain ranges, basins, and plateaus in western North America - it covers much of western North America, west of the Western Great Plains - extending from the U.S. state of Alaska and south to Mexico:

Western Cordillera (also called North American Cordillera, Western Cordillera of North America, Pacific Cordillera, and in Canada, in reference to the Canadian portion, the Canadian Cordillera)