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.
Shenmu City, which belongs to Yulin City, Shaanxi Province, is the site of Shiyi site, the eve of Chinese civilization, which is located in the border zone of northern Shaanxi and Qin-Jin-Meng provinces. With a total area of 7635 square kilometers, it is the largest county-level city in Shaanxi Province. Shenmu has a long history and was inhabited by human beings four or five thousand years ago. Shifeng site is the largest prehistoric city site and the center of civilization in northern China and the Yellow River valley more than 4000 years ago. In history, Shenmu has always been a border outpost guarding the Central Plains against foreigners. It is known as "Nanwei Guanzhong, Beiping Hetao, the danger of Jinyang on the left and Lingxia Chong on the right". In 2018, Shenmu had jurisdiction over 6 streets and 14 towns, with a resident population of 485000, with a GDP of 129.803 billion yuan, of which