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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.

Yanchuan County, which belongs to Yan'an City, Shaanxi Province, is located in the north of Shaanxi Province, northeast of Yan'an City, facing the Yellow River to the east and Yonghe County of Shanxi Province to the east, Qingjian County of Yulin City to the north, Zichang County to the northwest, Baota District to the west and Yanchang County to the south. 80 kilometers away from Yan'an, the county is 74.25 kilometers long from east to west and 51.5 kilometers wide from north to south. Between 109o 3620 "- 110o 2644" east longitude, 36o 3715m / m 37 °5 & #39;55" north latitude, with a total area of 1985 square kilometers. Yanchuan is the hometown of national modern folk art named by the Ministry of Culture. Li Kui, the only literary champion in northern Shaanxi, and Li Lulu, a poetess of the Qing Dynasty, are all in Yanchuan. Yanchuan writers represented by Lu Yao are famous in the Chinese literary world; paper-cut, cloth painting,
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