Join us for this easy to moderate 3.5 mile loop to see one of the most unlikely natural features found in the Bay Area: a volcano! The 1,763-foot Round Top volcano is the headliner, and its lava flows, which date back some 10 million years, deposited most of the volcanic rock now seen throughout the preserve. 

To explore this geologic wonder, start at the Sibley Staging Area east of Oakland. Use the paved Overlook Trail to get to the visitor center, where you can pick up a map for the self-guided volcanic tour. Hop onto the Round Top Loop Trail for 360-degree views of the Bay. 

Turn left onto Volcanic Trail, which hosts most of the points of interest from the tour. Connect onto the paved Quarry Road, then turn left on Skyline Trail back to the trailhead. Dogs are welcome, but must be on leash in areas where cattle are present.  https://www.ebparks.org/sites/default/files/sibley_map.pdf

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