San Diego is a major city in California, United States. It is in San Diego County, on the coast of the Pacific Ocean in Southern California, approximately 120 miles south of Los Angeles and immediately adjacent to the border with Mexico.
With an estimated population of 1,419,516 as of July 1, 2017, San Diego is the
eighth-largest city in the United States and second-largest in California. It is
part of the San Diego–Tijuana conurbation, the second-largest transborder agglomeration
between the US and a bordering country after Detroit–Windsor, with a population of
4,922,723 people. The city is known for its mild year-round climate, natural deep-water
harbor, extensive beaches, long association with the United States Navy, and recent
emergence as a healthcare and biotechnology development center.