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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.

Jiaxing, also known as "Hecheng", is a prefecture-level city in Zhejiang Province, the Yangtze River Delta Urban agglomeration, important cities in the Shanghai Metropolitan area, the core city in the Dawan area of Zhejiang Province, the vice central city of Hangzhou Metropolitan area and the central city of Shanghai-Jiahang G60 Science and Technology creation Corridor. located in the northeast of Zhejiang Province, the hinterland of the Hangjiahu Plain in the Yangtze River Delta. Jiaxing is located at the river-lake sea rendezvous, strangling the throat of the south corridor of Taihu Lake, less than 100 kilometers away from Shanghai, Hangzhou, Suzhou, Ningbo and other cities. The land area is 4275.05 square kilometers (including the water area of the Qiantang River, the dividing line between the river and sea of the Qiantang River is connected by Haiyan Qipu-Yuyaoxi three gates). Jiaxing system began in the Qin Dynasty, has more than 2000 years of human history, has been a prosperous and rich place since ancient times, known as the "land of fish and rice", "silk"
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