Definition: AVA = American Viticultural Area, aka an appellation. An AVA is an officially recognized grape-growing area in the U.S. Examples include Napa Valley and Willamette Valley.
When someone asks, What's the difference between Napa and Sonoma? I would say that Sonoma has a wider range of grapes grown and styles made. Napa is known for Cabernet Sauvignon, with Chardonnay a distant second. Sonoma County wine regions showcase the diverse climates and soils, resulting in an impressive variety of wines and styles.
