Sinkyone Wilderness State Park is located in the northwest corner of Mendocino county in northwestern California. The park contains some of the most beautiful seascapes on the coast of California. The park also contains one of the most challenging four wheel drive roads in all of California. The rut ridden Usal Road runs the full length of the park, and it provides access to the spectacular seascapes within the park. If you like high adventure, then buckle your seat belt and give the Usal Road a whirl.