Mount Diablo, Mountain summit in Contra Costa County, United States
Mount Diablo is a mountain summit in Contra Costa County, California, rising to 1,173 meters (3,849 feet). It dominates the view across the Bay Area and forms a widely visible elevation in an otherwise flat coastal landscape.
Spanish colonists called the mountain Cerro Alto de los Bolbones by 1811, after the Volvon tribe whose homeland covered most of it. The name Monte del Diablo, "devil's thicket", referred by 1824 to dense woods north of the peak, and "Mount Diablo" became official in 1850. Mount Diablo State Park was established in 1931.
The Ohlone people knew this peak as Tuyshtak and connected it to their creation stories. Today the mountain appears in local accounts about early settlement and remains a reference point across the region.
The protected area covers about 20,000 acres with trails for walkers, cyclists and drivers. Weather and visibility change quickly, so pack layers and enough drinking water.
California condors have been sighted here after more than 100 years of absence. Their return shows the success of decades of conservation work for these rare birds.
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