Chabot Vineyard lies east of the Silverado Trail, just  north of the road that leads up Howell Mountain to Bancroft Ranch and Steinhauer Ranch. The chunks of shiny obsidian heavily strewn through its soil reflect the locale, known as “Glass Mountain.” An underlying layer of pumice and bedrock ensures excellent drainage. The inky, highly structured, deeply flavored Cabernet from this vineyard was the first that Beringer Vineyards Winemaster Ed Sbragia elected to bottle as a Private Reserve in 1977, and he has continued to bottle a small amount each year since as a single-vineyard Cabernet.