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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.

Wujiang District, which belongs to Suzhou City, Jiangsu Province, is located in the southeast of Jiangsu Province, facing Shanghai to the east, Taihu Lake to the west, Zhejiang to the south and the main urban area of Suzhou to the north. The total area of the region is 1176.68 square kilometers, of which the water area is 26700 hectares, accounting for 22.70% of the total area of the city (excluding the water surface of Taihu Lake under its jurisdiction). As of June 2019, Wujiang District has jurisdiction over 4 streets and 7 towns, with a registered population of 832700 and a floating population of 979200. In 909 AD, Wujiang established a county; in 1992, Wujiang withdrew its county to build a city; in October 2012, Wujiang withdrew its city and set up a district for Wujiang District of Suzhou City. Wujiang is located in the south of the Yangtze River, with well-developed river systems, crisscross rivers and dotted lakes, Wujiang is known as the "land of fish and rice" and "the house of silk". The north of Wujiang
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