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.
Linxia County, which belongs to Linxia Hui Autonomous Prefecture, Gansu Province, is located in the central part of Gansu Province, southwest of Linxia Prefecture, bordering Linxia City, Dongxiang County and Hezheng County in the east, Gannan Cooperative City and Xiahe County in the south, Xunhua County in Qinghai Province in the west, Jishishan County in the northwest, and Yongjing County in the north across the river. The county is 53.1km wide from east to west and 59.85km from north to south, with a total area of 1212.4 square kilometers. It has jurisdiction over 6 towns, 19 townships and 2 ethnic townships, with a total of 219 administrative villages, 2101 villagers' groups, 2 neighborhood committees and 11 resident groups. The total population of the county is 386900 (2011), including Han nationality, Hui nationality, Dongxiang nationality,