San Diego is a city located on the Pacific coast of Southern California, situated adjacent to the Mexico–United States border. It serves as the county seat of San Diego County and ranks as the eighth-most populous city in the United States. The city has a population exceeding 1.4 million people, while its metropolitan area houses over 3.3 million residents.
The region is characterized by a mild Mediterranean climate and features extensive beaches and parks. Historically, San Diego is noted for its long association with the United States Navy. In recent years, the city has emerged as a significant development center for biotechnology, healthcare, electronics, and wireless technologies.