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.
Shandan County, which belongs to Zhangye City, Gansu Province, is located in the middle of Hexi Corridor. It is the east gate of Jinzhangye, an important town on Silk Road. It is adjacent to Yongchang to the east, Qinghai to the south and Alashan right Banner in Inner Mongolia to the north. It is 148km long from north to south and 89km wide from east to west, with a total area of 5402 square kilometers. Shandan County is 15505,4441 meters above sea level, surrounded by mountains on three sides, high in the southeast and low in the northwest, with a continental cold and semi-arid climate. The economy of Shandan County is mainly agriculture and animal husbandry, with 857000 mu of arable land and 460000 mu of perennial cultivated area. It is a semi-agricultural and semi-pastoral county. The county is rich in tourism resources, there are national 4A scenic spots, "Expo Holy Land" Yanzhi Mountain Forest Park. It has the largest military racecourse in Asia, Shandan Army Racecourse, which has become the location shooting venue for many films. Famous Buddhist temples