Robert Sibley Volcanic Regional Preserve
East Bay residents have a volcano in their backyard at Sibley Volcanic Regional Preserve. Originally called Round Top Park, Sibley shares with Temescal and Tilden the distinction of being one of the East Bay Regional Park District's original parks. The preserve was later named in honor of Robert Sibley, who helped found the District and served for 10 years on its board of directors.
Rules & Regulation
Round Top Road is paved to the top of Round Top. (Watch for occasional vehicles using the road.) There is also a 600-foot, paved wheelchair path north of the visitor center that ends at a viewing platform. Quarry Road, beginning at Old Tunnel Road, is also paved.