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Robert Sibley Volcanic Regional Conservation is located in the San Francisco Bay Area, California, Berkeley Hills of the East Bay area. The park is part of the Eastern Bay Regional Parks District and is located in Alameda County and partially Contra Costa County, east of Oakland, and occupies 928 acres of land (3,76 km2). You can join them on Skyline Boulevard from Oakland, or on Old Tunnel Road from Contra Costa County.


It was one of the three first parks developed in 1936 by the EBRPD (Eastern Bay Regional Parks District). Originally named the Area Round Top Park. The extinct volcano in the Berkeley Hills is the Round Top (1761 feet / 537 m high). It houses at least two recent stone labyrinths. The park was rebaptized shortly after EBRPD 's second president, Robert Sibley, died.


This preserve contains the volcanic core of the Pliocene Epoch which created most lava flows from the Inspiration Point in Tilden Regional Park to Moraga from the East Bay ridges some 10 million years ago. Geologists name this local volcano a Moraga Volcanics. The lava-bearing rock formations were subsequently folded into round vent complexes, formed by various local faults like Hayward Fault.


Folding, erosion and quarry operations exposed the large volcano to a cross-section, which is a great way to study a volcano in the California coast ranges. UC Berkeley dated Lava within the vent at the age of 9.5 million years.


In RSVRP, there are at least two man-made mazes. The Mazzariello Labyrinth is the first and most visited, perhaps. It is a favorite destination for hikers who come to pray, meditate and look at the talismans left by previous visitors in the center by East Bay resident Helena Mazzariello, despite the official gate hours, which are listed below, and Friends of the Labyrinth says that the labyrinth visitors have 24 hours per day 7 days per week. It's a special and special place to visit the city.


The following signpost on the Round Top Loop Trail refers to the left-crossing Volcanic Trail. The rider will see a smaller labyrinth in the shape of the heart at the post no. 4. This is not quite as intricate and appreciably not as commonly employed as the Mazzariello Labyrinth.


Many, previous labyrinths have been rejected in the preserves but Friends of the Labyrinth rejects these as urban legends because no evidence has been found. There is no evidence of these practices in study of high-resolution aerial images.


To reach the place, Take Fish Ranch Road from Highway 24, just east of the Caldecott Tunnel. Follow Grizzly Peak Boulevard for about 8 miles. Turn left onto Skyline Boulevard, 2.4 miles on Grizzly Peak. Turn left and drive about 1 mile to the left hand entrance. 


The nearest bus line, AC Transit # 305, runs only on Tuesdays and Thursdays, from mid-morning to mid-afternoon. Take the AC Transit bus no 59 or 59A from Lake Merritt BART or Rockridge BART; these bus lines go to the transit center in Montclair. From there, transfer to AC Transit bus 305 and exit at the stop on Colton Boulevard and Ridgewood Drive. Walk the close distance to Skyline Boulevard from Colton, turn left and walk to the preserve. The Huckleberry Preserve Staging Area is only a 0,9-mile walk away.

This amazing landmark is perfect for kids and is located near the following must-see sights in Lafayette, California:

  • Chabot Space and Science Center

  • Tilden Regional Park

  • Reinhardt Redwood Regional Park

  • Joaquin Miller Park

  • Briones Regional Park 

  • Regional Parks Botanic Garden

  • Las Trampas Regional Wilderness Park 

  • Roberts Regional Recreation Area

All of these wonderful attractions are located just a short drive from our location near Downtown Walnut Creek, California on Locust Street. Stop by for a visit anytime!

Image by Sergei Akulich
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