Subregions- Arizona
 - Arizona-Sonora border region
 - California-Arizona border region
 - California-Baja California border region
 - California-Nevada border region
 - Central California
 - near the coast of Northern California
 - near the coast of Oregon
 - Nevada
 - Nevada
 - Northern California
 - off the coast of California
 - off the coast of Northern California
 - off the coast of Oregon
 - Oregon
 - Southern California
 - southern Idaho

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