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.
Yanchi County, located in the east of Ningxia Hui Autonomous region, is a county under the jurisdiction of Yinnan region and a famous Tan sheep producing area in Ningxia. The border area between the agricultural and nomadic peoples of China in history. The county government is stationed in Huamachi town. County from southeast to northwest for the vast dry steppe and desert steppe, rich in "salt, fur, sweet licorice". Ningxia Tan Sheep, which is well-known at home and abroad, is the main economic source of Yanchi. There are more than 20 natural salt lakes in the north, east and southwest of the county, so it is named "salt pond". On December 7, 2016, Yanchi County was listed as the third batch of national comprehensive pilot areas for new urbanization. On September 29, 2018, the government of Ningxia Hui Autonomous region approved Yanchi County to withdraw from the sequence of poor counties. On October 22, 2018, he was selected as the first for the integrated development of the primary, secondary and tertiary industries in rural areas in 2018.