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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