Round Top is an extinct volcano (elevation 1,763 feet / 537m, 122.193°W, 37.85°N) in the Berkeley Hills

Berkeley Hills

The Berkeley Hills are a range of the Pacific Coast Ranges that overlook the northeast side of the valley that surrounds San Francisco Bay. They were previously called the "Contra Costa Range/Hills" , but with the establishment of Berkeley and the University of California, the current usage was...

, just east of Oakland, California

Oakland, California

Oakland is a major West Coast port city on San Francisco Bay in the U.S. state of California. It is the eighth-largest city in the state with a 2010 population of 390,724...

. The peak lies entirely within the bounds of Contra Costa County

Contra Costa County, California

Contra Costa County is a primarily suburban county in the San Francisco Bay Area of the U.S. state of California. As of the 2010 census, it had a population of 1,049,025...

. 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 (1948 to 1958), Robert Sibley, shortly after his death in 1958.