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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.

Anhui, abbreviated as "Anhui", named after the first words of Anqing and Huizhou at that time, is a provincial administrative region of the people's Republic of China. Hefei, the provincial capital. Located in East China, Anhui is bounded by 114o 54km east longitude, 119o 37km east longitude and 29o 41mm north latitude, Jiangsu and Zhejiang provinces in the east, Henan and Hubei provinces in the west, Jiangxi province in the south, Shandong province in the north, and Anhui province covering a total area of 140100 square kilometers. Anhui Province is located in East China, near the Yangtze River, with 800 miles of urban agglomeration along the Yangtze River and the Wanjiang Economic Belt, with the Yangtze River waterway inside and the economic radiation of the coastal areas on the outside. The terrain is composed of plains, hills and mountains; it spans the three major river systems of the Huaihe River, the Yangtze River and the Qiantang River. Anhui Province is located in the transitional zone between warm temperate zone and subtropical zone. The north of the Huaihe River has a warm temperate semi-humid monsoon climate.
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