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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.

Yihuang County, which belongs to Fuzhou City, Jiangxi Province, is located in the east-central part of Jiangxi Province and the south of Fuzhou City. Yihuang County was founded in Wu Taiping of the three Kingdoms for 2 years (257 AD). It has a history of 1759 years and gets its name because the county administration is located at the confluence of Yishui and Huangshui. Yihuang, known as the "opera town", is the birthplace of Erhuang Opera. Caoshan Temple in Yihuang is the ancestral court of the Zen Cao Dong sect. With a total area of 1944 square kilometers, the county has jurisdiction over 12 townships, 2 reclamation farms and 1 provincial industrial park, 139 administrative villages and 8 neighborhood committees with a total population of 240000, including she, Hui and Yao ethnic minorities, and most of the rest are Han nationality, belonging to the Jiangyou people. The topography and geomorphology of Yihuang County are mainly mountains and hills, and the general situation is "eight mountains and half water, one sub-field, half-divided roads and manors". Yihuang County has successively
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