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.
Zhengning County, which belongs to Qingyang City, Gansu Province, is located in the southeast of Qingyang City, Gansu Province, at the west foot of Ziwuling, east and Huangling County of Shaanxi Province, bounded by Ziwuling County in the east, Xunyi County in Shaanxi Province in the south, Bin County in Shaanxi Province in the southwest, Jinghe County in Shaanxi Province in the west and Ning County in Gansu Province in the north, with geographical coordinates of 35 °14 °40 "- 35 °36 °18" N and 107 °56 °20 "- 108 °38 °08" E The county covers an area of 1330.9648 square kilometers. Zhengning County has jurisdiction over 4 towns and 6 townships (at the end of 2011), with 7 communities, 94 villages and 677 village groups, with a total population of 239600 (2012). In 2012, Zhengning County achieved a gross domestic product (GDP) of 2.134 billion yuan, compared with 201.