Stretches from San Francisco Bay for roughly 120 miles. It covers more than 50 miles from the Pacific coastline and encompasses several important wine regions such as Napa Valley AVA, Sonoma County, Mendocino County, Lake County, Solano County and Marin County. There you can find the most important grape variety found in Napa Valley – Cabernet Sauvignon. AVA subregions of Napa Valley consist of Central AVAs, Western AVAs and Eastern Mountain AVAs.