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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.

Dengkou District, which belongs to Zhuzhou City, Hunan Province, is called "Lipu" in ancient times and is also known as "Xixiang". It is named for its location in the confluence of Xianshui and Xiangjiang River. Dengkou District is located in the east-central part of Hunan Province, the middle reaches of the Xiangjiang River, the territory of Huanshui to the east, Xiangjiang River to the north, Liling City and Youxian to the east, Hengdong County to the south, Xiangtan County to the west, Pilusong District and Tianyuan District to the north. Dengkou, with its superior location, has been the gateway to eastern Hunan since ancient times, is the throat of the Central Plains leading to the coast of Guangdong, and enjoys the reputation of "Pearl of Eastern Hunan". Located on the southern edge of Changsha-Zhuzhou-Xiangtan urban agglomeration, it is an important part of Zhuzhou's "one core, one circle, one corridor" development plan. As of February 2018, Dengkou District has jurisdiction over 8 towns, 129 villages and 10 communities, with a total area of 1053.6 square kilometers. It belongs to the experimental area of "two-oriented society" construction, of which 275 square meters.
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