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.
Lingtai County is an escrow county of Pingliang City, Gansu Province, located in the southeast of Gansu Province, bordering Changwu, Bin County, Linyou, Qianyang and Longxian of Shaanxi Province in the southeast, and Chongxin and Jingchuan County of Gansu Province in the northwest. The geographical coordinates are 107 °00 east longitude 107 °57km east longitude, 34 °54km north latitude, 35 °14km north latitude, 78 km east-west length, 40 km north-south width, and a total area of 2038 square kilometers. As of 2012, Lingtai County has jurisdiction over 5 towns, 8 townships, 1 street, a total of 4 communities, 1429 administrative villages and 1429 village groups, with a total population of 229752, most of whom are Han nationality, accounting for 96.7%. Ethnic minorities are Hui, Tibetan, Manchu, Miao, Mongolian and so on, accounting for 3.3%. In 2012, Lingtai County realized the regional gross domestic product (G