• San Francisco
  • Dangtu County

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.

Dangtu County, which belongs to Maanshan City, Anhui Province, is located in the east of Anhui Province and the east bank of the lower reaches of the Yangtze River. It is bordered by Bowang District and Shijiu Lake to the east, Lishui District and Gaochun District in Nanjing City, Jiangsu Province to the east, the Yangtze River to the west, across the river to Hexian County, Wuhu County and Xuancheng City to the south, and Yushan District to the north. Dangtu County has a history of more than 2200 years. Danyang County was established in the Qin Dynasty, and it was named Dangtu in the ninth year of Sui Kaihuang (589). In history, the county seat was the seat of Taiping Prefecture in Song Dynasty, Taiping Mansion in Ming and Qing dynasties, Yangtze River navigator in Qing Dynasty and Anhui Science and Government Office. Since the Qin Dynasty, it has attracted more than 600 poets to leave more than 1000 popular poems here. Xie Kui, a great poet of the Southern Dynasty, called it "the capital of mountains and rivers". The poem fairy Li Bai visited Dangtu seven times and wrote 56 unique poems such as "Wangtianmen Mountain".
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