Borrego Badlands viewed from Font's Point at sunrise. Colorado River sediments are laid bare by the unrelenting erosion of water, wind and time as seen at the northern edge of the Badlands. Anza-Borrego Desert State Park (Est. May 1948), largest state park in California 600,000 acres (2,400 km2); second-largest in continental US. Five hundred miles of dirt roads, 12 wilderness areas. Park named for Spanish explorer Juan Bautista de Anza and the Spanish word borrego, or bighorn sheep. San Diego County, CA.