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.
Yuanzhou District, which belongs to Guyuan City, Ningxia Hui Autonomous region, is located in the south of Ningxia, the northeast foot of Liupan Mountain and the central and western part of the Loess Plateau. It lies between 105 °28 degrees east longitude and 106 °30 'east longitude and 36 °38 degrees north latitude. It is bordered by Pengyang County in the east, Jingyuan County in the south, Xiji County in the west, Haiyuan County and Tongxin County in the north, and Huanxian County and Longde County in Gansu Province in the northeast and southwest, respectively. With a total area of 2739.01 square kilometers, it has jurisdiction over 3 streets, 7 towns and 4 townships. As of 2017, the total number of registered households in Yuanzhou District is 156100, and the total registered population is 464800. In 2017, Yuanzhou District achieved a GDP of 11.766 billion yuan, exceeding 11 billion yuan for the first time. September 2017