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.
Qingcheng County, which belongs to Qingyang City, Gansu Province, is located in the east of Gansu Province, the middle and upper reaches of Malian River, Heshui in the east, Puhe River in the west, Zhenyuan County in the west, Xifeng District in the south and Huanxian County and Huachi in the north. The geographical coordinates are 107 °16 "32"-108 °05 "49" east and 35 °42 "29"-36 °17 "22" north. It is about 70 kilometers from east to west and 56 kilometers from north to south. The total land area is 2692.6 square kilometers. Qingcheng County has jurisdiction over 5 towns and 10 townships (2011), with a total population of 320000 (2011). In 2011, the gross national product (GDP) of Qingcheng County reached 6.53 billion yuan, an increase of 13.8% over 2010 in terms of comparable prices. According to the public security population