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.
Qingtongxia City belongs to Wuzhong City, Ningxia Hui Autonomous region. It is located in the upper reaches of the Yellow River, in the middle of Ningxia Plain, between 105 °21'E longitude and 106 °21'E and 37 °36'N latitude to 38 °15'N. The Yellow River faces Lingwu City and Litong District of Wuzhong City in the east, Zhongning County, Zhongwei City in the south, Alashan Zuo Banner in Inner Mongolia Autonomous region in the west, and Yongning County in the north. Qingtongxia is 30 kilometers away from Litong District, where Wuzhong City is based, and 54 kilometers away from Yinchuan, the capital of the autonomous region. The city is more than 30 kilometers wide from east to west and more than 60 kilometers from north to south, with a total area of 2445 square kilometers. The total population is 283842 (2016). The government is stationed in Xiaoba town. In July 2003, the town was evacuated and the location of the municipal people's government was renamed Yumin Street.