San Diego County | Vibepedia

San Diego County, nestled in California's southwesternmost corner, is a sprawling region defined by its Pacific coastline, international border with Mexico, and a dynamic blend of urban centers and natural landscapes. As the second-most populous county in California and fifth in the U.S., it's home to over 3.3 million residents, with its namesake city, San Diego, serving as the county seat and a major metropolitan hub. This region is a critical nexus for military operations, hosting numerous [[U.S. Navy|Navy]], [[United States Marine Corps|Marine Corps]], and [[United States Coast Guard|Coast Guard]] installations, alongside a significant presence of 18 [[Native American tribes|Native American reservations]], the most in any U.S. county. Its economy thrives on sectors ranging from biotechnology and defense to tourism and agriculture, fueled by institutions like [[University of California, San Diego|UC San Diego]] and [[San Diego State University|SDSU]].