The U.S. is a top wine producer, with California leading at 90% of production. Napa Valley is famous for powerful Cabernet Sauvignon, while Sonoma shines with Pinot Noir and Chardonnay. Oregon's Willamette Valley excels in elegant Pinot Noir, and Washington State is known for robust Merlot and Syrah from the Columbia Valley. Notable producers include Robert Mondavi, Opus One, and Stag's Leap in Napa, Domaine Serene in Oregon, and Chateau Ste. Michelle in Washington.