The Petaluma Hole is a geographical region in Sonoma County, California which extends in a band from the Pacific Ocean to San Pablo Bay. It is an area of very low land 22 to 31 miles (35 to 50 kilometers) huge in the coast ranges of the northern San Francisco Bay Location.
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The western edge of the gap is found in the coastal lowlands involving Bodega Bay and Tomales Bay. The japanese edge of the hole is positioned at San Pablo Bay all around the mouth of the Petaluma River. The town of Petaluma is near the centre of the gap.

The Petaluma Gap influences wind patterns (and hence microclimates and air high quality) in the San Francisco Bay Place. Fresh marine air frequently blows eastward by the hole, branching into southward and northward streams which blow toward the Carquinez Strait and Santa Rosa respectively. The southward stream brings marine air overland into the central Bay Location from the northwest. Warm air rises from the land and enables chilly, moist air, furthermore winds and fog to move into the