What geographical features generally border the northern *C. o. oreganus* range in California?
Answer
West of the Cascade and Sierra Nevada ranges
The specific subspecies known as *Crotalus oreganus oreganus* dominates the northern and central parts of California, adhering closely to specific topographical boundaries. Its distribution is generally situated to the west of the major interior mountain barriers, namely the Cascade and Sierra Nevada ranges. Furthermore, its range extends northward from Santa Barbara County, where it begins the process of intergrading with southern relatives, maintaining a position generally eastward only as far as the proximity of the Pacific coast to its west.
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