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.
Yangqu County, historically known as "Sanjin Shouyi", belongs to Taiyuan City, Shanxi Province, which is located in the backbone of Xinzhou and Jinzhong basin. Jiaojin key point, Taiyuan gate. The east, west and north are surrounded by mountains, while the south is low and flat. It is bordered by Yu County in the east, Jingle County and Gujiao City in the west, Taiyuan City in the south, Xinzhou City in the north, Dingxiang County in the northeast and Shouyang County in the southeast. Jingbei mountain system stretches from east to west, and Yunzhong mountain system runs through the north and south, because of the north barrier, which is known as the north gate of Taiyuan, which is a necessary place for soldiers. Yangqu County has 579 cultural relics protection units (including 5 at the national level, 4 at the provincial level and 24 at the municipal level). In 2007, together with Pingyao, Dunhuang, Dali and other historical and cultural places, it was selected as the "66 major counties of Chinese cultural tourism in a lifetime". Yangqu has a dense road network, 108 National Highway.