The Southwestern California Bioregion, also known as the Southern California Coast Bioregion, is the fourth of the bioregions that converge on Tejon Ranch. It reaches Tejon’s southwestern border along the eastern edge of the Transverse Range. This region includes everything from off-coast islands, to the narrow mountain ranges and fault blocks that characterize the southwestern portion of Tejon. Its ecological communities include coastal wetlands, vernal pools, riparian woodlands and coastal sage scrub. Largely due to its sprawling urban centers, this region contains more special status species than any other region in the contiguous United States.