Though a small region, Napa Valley is considered to be one of the top wine producers in the USA. It is uniquely suited to the cultivation of a range of grape varieties including, its signature Cabernet Sauvignon, along with Merlot, Pinot Noir, Chardonnay, Sauvignon Blanc, Sangiovese, Zinfandel and Cabernet Franc. Situated in Northern California around the city of Napa, the region is only 30 miles long and around 5 miles wide. Summer weather in the southern part of the valley, in wine districts such as Carneros, Yountville, and Oakville, can be distinctly cooler than that of the Calistoga area at the north end of the valley. Most of Napa Valley’s wineries are small-scale operations.