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.
Huangzhong District is a district under the jurisdiction of Xining City, Qinghai Province. it is located in the east of Qinghai Province, bordering Huangyuan County of Xining City to the west, and bordering on the south, north and east, respectively, adjacent to the middle of the city, north of the city, west of the city and east of the city. The geographical coordinates are 36 °13 °32 "~ 37 °03 °19" east longitude 101 °09 32 "~ 101 °54 square kilometers, with a total area of 2700 square kilometers. As of 2018, Huangzhong District has jurisdiction over 1 street, 10 towns, 5 townships, and another township-level unit: Ganhe Industrial Park. By the beginning of 2019, the region has a resident population of 460100, which is a large population area in Qinghai. There are 13 ethnic minorities, including Hui, Tibet, Turkey and Mongolia. In 2011, the gross domestic product (GDP) of Huangzhong District reached 12.445 billion yuan.