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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.

Yiyang, alias "Silver City", "Lido" and "hometown of Badminton", is a prefecture-level city of Hunan Province, located on the south bank of Dongting Lake in the middle and lower reaches of the Yangtze River, located in the north of Hunan Province, at the eastern end of Xuefeng Mountain and its remaining vein belt. It is an important member of the urban agglomeration in the middle reaches of the Yangtze River, one of the core cities around Dongting Lake eco-economic circle, and one of the Changsha-Zhuzhou-Xiangtan 35th urban agglomeration. It has successively won provincial garden cities and national forest cities. National health city, national civilized city nominated city, historical and cultural city of Hunan Province and other titles, has been a rich "land of fish and rice" in the south of the Yangtze River since ancient times. Yiyang City has jurisdiction over 3 counties (Anhua County, Taojiang County,.
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