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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

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.
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