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.
Suide County, located in the north of Shaanxi Province, southeast of Yulin City, is located in the hilly and gully region of the Loess Plateau in northern Shaanxi. Suide County has jurisdiction over 4 townships and 12 towns and 661 administrative villages, with a total population of 359500 (2016). Suide has a long history and a collection of humanities, formerly known as "Shangjun Guyi". It is known as "famous state in the world", "famous state in Qin and Han Dynasty" and "dry wharf" in northern Shaanxi. In March 2019, it was listed as the first batch of revolutionary cultural relics protection and utilization district and county list. On May 7, 2019, the people's Government of Shaanxi Province approved Suide County to withdraw from the sequence of poor counties.