The Pre-Coastal Range refers to a series of geological formations located in the western United States, primarily in California. This region is characterized by its rugged terrain and diverse ecosystems, which include forests, grasslands, and chaparral. The formations are primarily composed of sedimentary and volcanic rocks, shaped by tectonic activity and erosion over millions of years. This area serves as a natural barrier between the coastal regions and the interior valleys. It plays a crucial role in influencing local climate patterns and hydrology. The Pre-Coastal Range is also home to various wildlife species and is significant for recreational activities such as hiking and camping.