AVA area (also known as Carneros) in the North Coast region of California. It extends across the border in the two counties of Napa and Sonoma. The name Carneros is derived from the Spanish word for "ram" and refers to the former use of this region as grazing land for sheep by Mexican farmers. Near the town of Sonoma, Californian wine-growing pioneer Agoston Haraszthy (1812-1869), who immigrated from Hungary, founded the historic Buena Vista Winery. The vineyards cover around 3,500 hectares of vines in a gentle hilly landscape with cool sea breezes from the nearby Pacific Ocean. The two dominant grape varieties are Chardonnay and Pinot Noir, from which acid-accentuated still wines are made. The cool climate is ideal for the production of sparkling wines. The wines are also marketed under the superior AVA Napa Valley. Well-known producers with vineyards in this area are Beaulieu Vineyard, Charles Krug Winery, Codorníu, Mondavi and Mumm (Mumm Napa).