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.
Shanxi, referred to as "Jin", the provincial administrative district of the people's Republic of China, the capital of Taiyuan, is located in North China. Shanxi is bounded by 34 °34km north latitude and 114o 14km east longitude, bordering Hebei to the east, Shaanxi to the west, Henan to the south and Inner Mongolia to the north, with a total area of 156700 square kilometers. The topography of Shanxi Province is a parallelogram oblique to the southwest, which is a typical mountain plateau covered by loess, which is high in the northeast and low in the southwest. The internal ups and downs of the plateau, vertical and horizontal river valleys, landforms have mountains, hills, platforms, plains, mountain areas account for 80.1% of the total area. Shanxi Province straddles the Yellow River and Haihe River, and the river belongs to the self-produced outflow type. Shanxi Province is located in the inland of the middle latitudes and belongs to the temperate continent.