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.
Huachi County, which belongs to Qingyang City, Gansu Province, is located in the east of Gansu Province and northeast of Qingyang City, bordering Zhidan, Wuqi and Dingbian in Shaanxi Province in the northeast, and Huanxian, Qingcheng and Heshui in the southwest. It is located between longitude 107 °29 "108 °33" east and latitude 36 °07 "36 °51 'north. It has jurisdiction over 4 towns and 11 townships, with a total land area of 3776 square kilometers and a total population of 138000 (resident population in 2016). In 2013, the GDP of Huachi County reached 9.2 billion yuan. Huachi County has been awarded as "National Scientific and technological Progress County", "National Advanced County in surveying and Mapping Management", "Provincial double support Model County", "Provincial Greening Model County", "Provincial civilized County" and "Provincial Health County" by the state and province. December 2016, listed as the third batch