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.
Liangzhou District, known as Gudu and Xiutu in ancient times, is located in the longitude of 101 °59 and the latitude of 37 °23 and 38 °12, respectively. It is located in the northwest of Gansu Province, the eastern end of Hexi Corridor, the northern foot of Qilian Mountain and the middle of Wuwei City, with an average elevation of 1632 meters. Liangzhou District belongs to Wuwei City, Gansu Province, bordering Inner Mongolia Autonomous region to the east, Sunan Yugu Autonomous County to the west, Tianzhu Tibetan Autonomous County and Gulang County to the south, and Yongchang County and Minqin County to the north. As of 2014, Liangzhou District has a total area of 5081 square kilometers, living in Han, Hui, Tibetan, Manchu and other 25 ethnic groups, with a total population of 1.0225 million (2012). In 2018, the district has jurisdiction over 37 towns, 2 headquarters and 8 urban subdistrict offices. Liangzhou District has a temperate continental arid climate, 20