Napa Valley is the most prestigious winegrowing region in the United States, known around the world for its rich wines, glamorous wineries, and uniquely Californian attitude—a blend of pioneer spirit and casual sophistication. Napa Valley was the very first American Viticultural Area (AVA) to be established in California, and only the second AVA in the entire country. With borders ranging from the rolling hills of Los Carneros to the south, up through the rich riverbed soils of the valley, and along the mountainous boundaries to the east and west, the region encompasses a diverse range of geology as well as people. Today, 16 sub-regions of Napa Valley are officially recognized as unique AVAs in their own right, offering visitors a full spectrum of landscapes, wine styles, and wine-tasting experiences.