Naval Amphibious Base Coronado is a US naval installation located across the bay from San Diego, California. The base, situated on the Silver Strand, between San Diego Bay and the Pacific Ocean, is a major Navy shore command, supporting over 30 tenant commands, and is the West Coast focal point for special and expeditionary warfare training and operations. The on‑base population is 5,000 military personnel and 7,000 students and reservists. The base is one of the eight components of Naval Base Coronado (NBC).

San Diego Bay is a natural harbor and deepwater port located in San Diego County, California near the U.S.–Mexico border. The bay, which is 12 miles (19 km) long and 1 to 3 miles wide, is the third largest of the three large, protected natural bays on California's 840 miles (1,350 km) of coastline, after San Francisco Bay and Humboldt Bay. The highly urbanized land adjacent to the bay includes the city of San Diego and four other cities: National City, Chula Vista, Imperial Beach and Coronado.