California wine is produced in the state of California, which is the largest wine-producing region in the United States. The state's diverse climate and geography allow for a wide variety of grape types, including popular ones like Cabernet Sauvignon, Chardonnay, and Pinot Noir. The Napa Valley and Sonoma County are two of the most famous wine regions, known for their high-quality vineyards and wineries. The California wine industry began in the 18th century and has since grown significantly, contributing to both local and global markets. Many wineries offer tours and tastings, attracting tourists and wine enthusiasts. California wines are celebrated for their unique flavors and styles, reflecting the state's rich agricultural heritage.