• San Francisco
  • Sihong County

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.

Sihong County, under the jurisdiction of Suqian City, Jiangsu Province, is located in the northwest of Jiangsu Province, the lower reaches of the Huaihe River, Hongze Lake to the east and Anhui to the west, located in the cross-radiation area of the Yangtze River Delta Economic Zone and the Huaihe River eco-economic belt, with an administrative area of 2731 square kilometers and a population of 1.1 million. It is the hometown of famous wine, crab and eco-tourism in China. Sihong is the wine capital of China. Shuanggou Daqu, one of the top ten famous wines, is produced here. Sihong sits on 40% of the water surface of Hongze Lake, one of the four major freshwater lakes in China, and is embedded in the national Hongze Lake Wetland Park. Sihong gave birth to an ancient civilization. Fifty thousand years ago, the people of Xiacaowan lived here after the water and thrived. It is one of the centers of biological evolution in the Cenozoic world, and it is also one of the centers of human origin.
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