Southern California is a region of California. The definitions of it vary, but it usually contains the area around Los Angeles and San Diego, as well as the "Inland Empire" of San Bernardino and Riverside Counties. Over twenty million people live in Southern California. The ten counties of Southern California include Imperial County, Kern County, Los Angeles County, Orange County, Riverside County, San Bernardino County, San Diego County, San Luis Obispo, Santa Barbara County, and Ventura County.