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.
Haiyuan County, which belongs to Zhongwei City, Ningxia Hui Autonomous region, is located in the central and southern part of Ningxia Hui Autonomous region. It is located in the arid zone of central Ningxia, between 105 °09 east longitude 106 °10 'and 36 °06 north latitude 37 °04'. It is connected with Yuanzhou District of Guyuan City in the east, Xiji County in the south, Jingyuan County and Huining County in Gansu Province in the west, Shapotou District and Tongxin County in Zhongwei City to the north. It is 95 kilometers from north to south and 80 kilometers from east to west, with a total area of 6899 square kilometers. The total population is 456600 (household registration in 2016), and the government is stationed in Haicheng town. Haiyuan County is a large agricultural population county integrating arid mountainous areas, old revolutionary base areas and Hui inhabited areas, and it is also a key county in the national poverty alleviation work. In 2016, Haiyuan County achieved a GDP of 4.893 billion yuan. 2008