Robert Sibley Volcanic Regional Preserve

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Robert Sibley Volcanic Regional Preserve is located in the Oakland Hills just east of Oakland, California, USA. Though it can only be entered via Oakland, it actually lies almost entirely within Contra Costa County. The park was one of the first three parks established by the East Bay Regional Parks District (EBRPD) in 1936. It was originally named Round Top Regional Park. Round Top (elevation 1,761 feet/537m) is an extinct volcano in the Berkeley Hills. It is home to several stone labyrinths of recent origin. The park was re-named for the second president of the EBRPD, Robert Sibley, shortly after his death.