• San Francisco
  • Dingyuan 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.

Dingyuan County, which belongs to Chuzhou City, Anhui Province, is located in the east of Anhui Province, between latitude 32 °12'- 32 °42'N and longitude 117 °12'- 118 °5'E. it is located in the eastern part of Anhui Province, between the hinterland of eastern Anhui and the western part of the Yangtze River Delta, which is connected with Jiangsu, Zhejiang and Shanghai, covering an area of 2998 square kilometers and cultivated land of 2.469 million mu. By the end of 2017, Dingyuan County had a population of 974900 and had jurisdiction over 22 townships and 253 administrative villages. The topography of Dingyuan County is generally high in the north and low in the south. The landforms in the territory are divided into three types: hills, wavy plains and plains. In ancient times, it has the reputation of "Jinglian Bayi, Qutong nine provinces", and it is still the key point of China's north and south. The Beijing-Shanghai high-speed railway and the Huainan railway run through the territory, and the Beijing-Taiwan highway runs across the territory. Was listed as a country in 1987
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