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.
Dancheng County is under the jurisdiction of Zhoukou City, located in the east of Henan Province, at the junction of Henan and Anhui provinces, and its geomorphology is the East Henan Plain. The Sui Dynasty opened the emperor six years (586) Zidan County, for the beginning of the city of Jindan County, the Tang Dynasty waste Dan County, most of the history of Luyi County, Dancheng County was established in 1952. By the end of 2013, Dancheng County had a registered population of 1403085 and a resident population of 952600; it had jurisdiction over 8 towns, 11 townships, 3 streets and 1 industrial agglomeration area, 523 village-level organizations (488 administrative villages and 35 neighborhood committees), with a total area of 1490 square kilometers. In 2010, the GDP of Dancheng County reached 13.732 billion yuan, an increase of 12.3% over 2009. There are famous ruins such as Prince Shengxian Pavilion and Princess Mausoleum in Dancheng County.