Napa County–Sonoma County line
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UNEXPLORED
The Napa County–Sonoma County line is the boundary between Napa and Sonoma counties in Northern California, running through the Mayacamas Mountains and including the area around Mount St. Helena.
Referenced by (1)
| Subject (surface form when different) | Predicate |
|---|---|
|
Mount St. Helena
→
|
straddles |