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.
Zhangjiachuan Hui Autonomous County belongs to Tianshui City, Gansu Province, located in the southeast of Gansu Province, northeast of Tianshui City, bordered by Longxian County, Shaanxi Province in the east, Qingshui County in the south, Qinan County in the west, and Huating and Zhuanglang counties in the north. With a total area of 1311.8 square kilometers (2010) and a population of 332496 (2011), e-commerce has entered the rural comprehensive demonstration county. In 2011, Zhangjiachuan achieved a GDP of 1.76576 billion yuan. Zhangjiachuan Hui Autonomous County has Guanshan Qinjiayuan scenery, wheat accumulation, Huaguoshan Shuiliang Cave and other famous scenic spots. In December 2019, Lintan County won the seventh batch of national unity and progress demonstration areas (units).