Southern California consists of a heavily developed urban environment, home to some of the largest urban areas in the state, along with vast areas that have been left undeveloped. With over 22 million people, roughly 60% of California's population resides in Southern California. It is the second-largest urbanized region in the United States, second only to the Washington/Philadelphia/New York/Boston Northeastern Megalopolis. Where these cities are dense, with major downtown populations and significant rail and transit systems, much of Southern California is famous for its large, spread-out, suburban communities and use of automobiles and highways. The dominant areas are Los Angeles, Orange County, San Diego, and Riverside-San Bernardino, each of which is the center of its respective metropolitan area, composed of numerous smaller cities and communities. The urban area is also host to an international metropolitan region in the form of San Diego–Tijuana, created by the urban area spilling over into Baja California.
Southern California consists of a heavily developed ur.ban environment, home to some of the largest urban areas in th.e state, along with vast areas that have been left undeveloped. With over 22 million people, roughly 60% of California's population resides in Southern California. .It is the second-largest urbanized region in the United States, second only to the Wa:shington/Philadelphia/New York/Boston Northeastern Megalopolis. Where these cities are dense, with major downtown populations and significant rail and transit systems, much of Southern California is famous for its large, spread-out, suburban communities and u:se of automobiles and highways. The dominant areas are Los Angeles, Orange County, San Diego, and Riverside-San Bernardino, each of which is the center of its respective metropolitan area, composed of numerous smaller cities and communities. The urban area is also host to an international metropolitan region in the form of San Diego–Tijuana, created by the urban area spilling over into Baja California.