Located at the foot of Sonoma Mountain, Penngrove is nicely situated between Petaluma and Cotati. Rich with obsidian and petrified wood due to Sonoma Mountain’s ancient volcano eruptions, Penngrove has a unique adobe soil that was used for building materials for centuries. A quintessential, charming small town, Penngrove celebrates a 4th of July parade every year downtown, sponsored by the local firemen. Offering both rural and residential properties, Penngrove is an ideal locale to fully enjoy the North Bay Area. Click here for available Penngrove listings.