San Diego (/ ˌ s æ n d i ˈ eɪ ɡ oʊ / ⓘ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]) is a city on the Pacific coast of Southern California, adjacent to the Mexico–United States border.With a population of over 1.3 million, it is the eighth-most populous city in the United States and the second-most populous in the state of California.San Diego is …