San Diego, San Diego County, California, USA

San Diego occupies the southwestern corner of California along the Pacific Ocean, just north of the Mexican border, with beaches, mesas, canyons and the broad natural harbor of San Diego Bay. Its mild climate and long coastline give the city a strong outdoor identity, while neighborhoods stretch from the historic center and bayfront to inland valleys and northern coastal districts. Kumeyaay people have lived in the region for thousands of years, and the Spanish settlement founded in 1769 became the first permanent European colony in what is now California. San Diego had about 1.4 million residents in 2025. The military, tourism, international trade, life sciences, technology, education and manufacturing anchor its economy.