San Diego is a coastal Southern California city located in the southwestern corner of the continental United States.

As of 2005, the city has a population of 1,255,540 people. It is the second largest city in California and the seventh largest in the United States.[1] It is the county seat of San Diego County.GR6 The San Diego metropolitan area has over 2.9 million people while the larger metropolitan area, which includes Tijuana, Mexico, is the 21st-largest in the Americas, with a population over 4.8 million.

San Diego lies just north of the Mexican border (shares border with Tijuana, Mexico) and lies south of Orange County. It is home to miles of beaches, a mild Mediterranean climate and many military institutions, such as the United States Navy, the United States Coast Guard and the United States Marine Corps.

The University of California, San Diego (UCSD) and the affiliated UCSD Medical Center combined with nearby research institutes in the Torrey Pines area of La Jolla make the area influencial in biotechnology research. San Diego's economy is largely composed of agriculture, biotechnology/biosciences, computer sciences, electronics manufacturing, defense-related manufacturing, financial and business services, ship-repair and construction, software development, telecommunications and tourism.


The city of San Diego itself has deep canyons separating its mesas, creating small pockets of natural parkland scattered throughout the city. Downtown San Diego is located on San Diego Bay. Balboa Park lies on a mesa to the northeast. It is surrounded by several dense urban communities and abruptly ends in Hillcrest to the north. The Coronado and Point Loma peninsulas separate San Diego Bay from the ocean. Ocean Beach is on the west side of Point Loma. Mission Beach and Pacific Beach lie between the ocean and Mission Bay, a man-made aquatic park. La Jolla, an affluent community, lies north of Pacific Beach. Mount Soledad in La Jolla offers views from northern San Diego County to Mexico. Mountains rise to the east of the city, and beyond the mountains are desert areas. Cleveland National Forest is a half-hour drive from downtown San Diego. Numerous farms are found in the valleys northeast and southeast of the city. San Diego County has more endangered plant and animal species (as determined by US Environmental Protection Agency) than any other county in the United States.[