California, United States
Round Top is an extinct volcano (elevation 1,763 feet / 537m, 122.193°W, 37.85°N) in the Berkeley Hills, just east of Oakland, California. The peak lies entirely within the bounds of Contra Costa County. In 1936, the area surrounding the peak was established as Round Top Regional Park, one of the first three parks of the East Bay Regional Parks District. The park was re-named Sibley Volcanic Regional Preserve for the second president of the park district, Robert Sibley, shortly after his death.