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.
Yongding District (ancient Yongding County, Tingzhou Capital) is located in the southwest of Fujian Province, connecting Nanjing County to the east, Pinghe County to the southeast, Dapu County and Meixian County in Guangdong Province to the southwest, Shanghang County to the northwest and Xinluo District to the northeast, with a total area of 2223 square kilometers. Human beings have lived together and thrived since the Neolithic Age. Ming Chenghua 14 years (1478), analysis of Shanghang County, home Yongding County. In 2014, Yongding County was abolished and Yongding District of Longyan City was established. Yongding is the "southern mining area" and "the hometown of flue-cured tobacco", and its geothermal resources rank first in Longyan City. The streams in the territory belong to the three major river systems of Ting River, Jiulong River and Meijiang River. Ting River, Yongding River, Jinfeng River, Huangtan River, Fuxi, Qiling River and other basins cover an area of more than 100 square kilometers. Mianhuatan Hydropower Station is the second largest hydropower station in Fujian Province.