San Diego (/ˌsæn diˈeɪɡoʊ/ SAN dee-AY-goh, Spanish: [san ˈdjeɣo]; Spanish for 'Saint Didacus') is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United States and the seat of San Diego County, the fifth most populous county in the United States, with 3,338,330 estimated residents as of 2019. The city is known for its mild year-round climate, natural deep-water harbor, extensive beaches and parks, long association with the United States Navy, and recent emergence as a healthcare and biotechnology development center. San Diego is the second largest city in the state of California, after Los Angeles.
Qishan County, which belongs to Baoji City, Shaanxi Province, is located in the west of Guanzhong along the ancient Silk Road and modern Eurasian Continental Bridge, and northeast of Baoji City. Linyou County to the north, Taibai County to the south, Fufeng and Mei County to the east, Fengxiang County and Chencang District to the west. With a total area of 856.45 square kilometers, it is a warm temperate continental monsoon semi-humid climate. Qishan County is one of the birthplaces of the Chinese nation, the birthplace of Emperor Yan and Zhou Dynasty, the birthplace of Zhou culture, and the birthplace of Huang Di Nei Jing and Zhouyi, a masterpiece of national medicine. With a long history and splendid culture, it enjoys the reputation of "hometown of bronze ware", "hometown of oracle bone inscriptions", "ancient county of thousands of years of China", "hometown of folk art", "hometown of Shaanxi cuisine" and "hometown of drum". Won "