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.
Gulang County, which belongs to Wuwei City, Gansu Province, is located in the central part of Gansu Province, the eastern end of Hexi Corridor, the northern foot of Wushaoling and the southern edge of Tengger Desert. The geographical coordinates are 37 °09 north latitude 37 °54 mi, east longitude 102 °38 mi 103 °54'. It is bordered by Jingtai County in the east, Tianzhu Tibetan Autonomous County in the south, Liangzhou District in the northwest and Alashan left Banner in Inner Mongolia Autonomous region in the northeast. The county is about 102km long from east to west and 88km wide from north to south, with a total area of 5103 square kilometers. As of 2011, Gulang County has jurisdiction over 9 towns, 10 townships, 1 street, 250 villages and 1934 village groups, with a total population of 388943. There are ten ethnic groups, including Han, Hui, Tibetan, Mongolian, Miao, Manchu, Dongxiang, Tu, Maonan and Yao.