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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.

Sihui is a county-level city hosted by Zhaoqing City, Guangdong Province. Because of the place where the four rivers (Xijiang, Beijiang, Suijiang and Longjiang) will flow, it is named "Sihui". Located in the middle of Guangdong Province, east of Zhaoqing, the northwest edge of the Pearl River Delta, located in the lower reaches of the West, North and Suisanjiang River, the Tropic of Cancer divides the whole territory into two. It is bordered by Sanshui District of Foshan City in the east, Dinghu District of Zhaoqing City in the south, Guangning County in the northwest and Qingxin District of Qingyuan City in the northeast, which belongs to the Pearl River Delta Economic Zone. It entered the ranks of the top 100 counties (cities) in the rural economy and the top 100 counties (cities) in the country in 1993 and 1994 respectively, and achieved a well-off society in 1996. In 2014, Sihui City ranked 97th among the top 100 counties and cities with comprehensive strength of small and medium-sized cities in China and 100 small and medium-sized cities with the most investment potential in China.
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