State Route 12 is a significant highway located in the U.S. state of California. It stretches approximately 120 miles, connecting the cities of Vallejo and Eureka. The route traverses diverse landscapes, including coastal areas and mountainous regions, making it a scenic drive for travelers. The highway serves as an important transportation corridor, facilitating access to various communities and attractions along the way. Notably, it passes through Napa Valley, known for its vineyards, and the Redwood National and State Parks, which are famous for their towering trees and natural beauty.