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.
Yuancheng District, Heyuan City, Guangdong Province, is the political, economic and cultural center of Heyuan City, the seat of the CPC Heyuan Municipal Party Committee and Municipal people's Government, located at the confluence of Dongjiang and Xinfengjiang, and belongs to the Hakka dialect area. Yuancheng District is centered on the old city, bordering on Linjiang Town, Xingang Town, Dongyuan County in the west, Shiba Town, Boluo County in the south, and Xiantang Town, Dongyuan County in the north. Yuancheng District is located between longitude 114o 31: 34 "east and latitude 23 °31: 21" to 23 °51', with a total area of 361square kilometers. as of 2018, the registered population is 325400, the resident population is 525700, and the regional GDP is 39.8 billion.