California State Route 166 is a state highway located in California, running approximately 40 miles from U.S. Route 101 in the west to State Route 33 in the east. The route primarily traverses the scenic landscapes of Santa Barbara County and Kern County, providing access to various rural communities and agricultural areas. The highway is known for its winding roads and picturesque views, particularly as it passes through the Cuyama Valley. It serves as an important connector for local traffic and is often used by travelers exploring the natural beauty of the surrounding regions.