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.
Huadian City, which belongs to Jilin City, Jilin Province, with an administrative level of county-level city, is located in the southeast of Jilin Province, on the north side of Longgang Mountains, the upper reaches of the second Songhua River, Dunhua City on the east boundary, Jingyu County, Fusong County and Huinan County in the south, Panshi City in the west, and Yongji County and Jiaohe City in the north. With its superior geographical location and convenient transportation, it has formed a transportation network extending in all directions. Huadian City, with an area of 6624 square kilometers, is one of the largest cities in Jilin Province. In September 2019, it was selected as a pilot county for the construction of medical community in a compact county.