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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.

Yibin, a prefecture-level city in Sichuan Province, is known as "the first city of the Yangtze River, the wine capital of China, and the bamboo capital of China". Located in the junction of the three provinces of Yunnan, Guizhou and Sichuan, at the confluence of Jinsha River, Minjiang River and Yangtze River; the terrain is high in the southwest and low in the northeast, which belongs to the humid climate of the mid-subtropical monsoon, and the forest coverage of the city is more than 46%. The content of negative oxygen ions in the air is as high as 47000 / cubic centimeter (Qidonggou), which is extremely suitable for human habitation. Changning County in the area has become a famous Changshou County. It covers an area of 13283 square kilometers and has jurisdiction over 3 districts and 7 counties. At the end of 2018, the registered population is 5.523 million. Yibin has a profound cultural heritage, with a history of 2200 years of city building, 4000 years of wine-making history and 3000 years of tea-growing history. It is a famous national historical and cultural city. There have been a large number of celebrities in past dynasties, who have raised Li Shuoxun.
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