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.
Daxin County is a border county in Guangxi, China, and it is also a county under the jurisdiction of Chongzuo City, Guangxi Zhuang Autonomous region. Daxin County is located in the southwest of Guangxi, between latitude 22 °29 / 23 °05 'north and longitude 106 °39 / 107 °29' east, Longan County in the northeast, Tiandeng County in the north, Jingxi City in the northwest, Longzhou County in the southwest, and the Democratic Republic of Vietnam in the west. the national boundary is more than 40 kilometers long, and the county people's government is 143 kilometers away from Nanning, the capital of the autonomous region. Daxin County has a long history. Human beings lived here more than 4500 years ago in the early Neolithic Age. Daxin is an area where the chieftain has ruled for a long time and has a relatively complete system. On January 25, 2019, he was selected as the national "Ping an Agricultural Machinery" demonstration county in 2018. March 2019, ranked the first