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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.

Duolun County, which belongs to Xilingol League of Inner Mongolia Autonomous region, is located at the southern end of Xilingol League and the eastern end of the northern foot of Yinshan Mountain. Longitude 115 °30, longitude 116 °55, latitude 41 °45, longitude 42 °39'. It is connected with Zhenglan Banner in the west, Keshikten Banner in Chifeng City in the north, and Guyuan County, Fengning County and Weichang County in the south. The total area is 3863 square kilometers. In 2011, it was approved to build a central city by the government of Inner Mongolia Autonomous region and Xilingol League. County people's government in Duolun Nur town. It won the honorary title of famous historical and cultural town in China in 2008 and the honorary title of famous landscape tourism town with national characteristics in 2010. In September 2018, he won the title of "China Natural oxygen Bar". On April 18, 2019, the people's Government of Inner Mongolia Autonomous region decided Duolun County.
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