California State Route 12 is a scenic highway that stretches approximately 88 miles across northern California. It begins in the city of Suisun City and travels eastward, passing through picturesque areas such as Napa Valley and Sonoma County. The route is known for its beautiful landscapes, including vineyards and rolling hills. The highway connects several key towns, including Napa, Sonoma, and Lodi, making it an important thoroughfare for both locals and tourists. California State Route 12 also provides access to various recreational areas, including parks and lakes, enhancing its appeal for outdoor enthusiasts.