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.
Shuozhou, located in the north of Shanxi Province, China, is located in the upper reaches of the Sanggan River, adjacent to the Inner Mongolia Autonomous region in the northwest and Yanmenguan pass in the south. The geomorphological outline is generally surrounded by mountains on the north, west and south, with high mountains and relatively low alluvial plains in the middle. It belongs to temperate continental monsoon climate. Under the jurisdiction of two districts, one city and three counties (Shuocheng District, Pinglu District, Huairen City, Shanyin County, Ying County, Youyu County), a total of 73 townships (including street offices), 1591 administrative villages, with a total area of 10600 square kilometers, with a resident population of 1.776 million in 2017. With an average elevation of 1000 meters above sea level, Shuozhou is a national summer resort and a "back garden" for summer leisure in Beijing and Tianjin, with an average elevation of 1000 meters. The city has 80 scenic spots of all sizes, including 4 4A-level scenic spots and national level.