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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.

Guanxian, a county under the jurisdiction of Liaocheng City, Shandong Province, is located at the junction of Hebei, Shandong and Henan provinces, with Dongchangfu District to the east, Linqing City to the north and Shenxian to the south. The whole territory is located in the yellow flood plain in northwest Shandong, which is part of the North China Plain with four distinct seasons; the total area is 1152 square kilometers. Jurisdiction over 3 streets, 11 towns, 4 townships; 2016 total population of 866300. Guanxian has a long history. Ran Zi, a disciple of Confucius, traveled here for a long time, and Xiaocheng, an ancient city in the Song and Liao dynasties, survived. In Guanxian, Ji-Yi Railway connects Jingjiu to the east and Jing-Guang to the west, Qinglan Expressway and 329 Provincial Highway run through the whole territory. Jingjiu Highway and National Highway 106 run through the north and south; Chaquan, Liulin Huagu and Langzhuang flour sculptures all originated in Guanxian. In 2016, the GDP of Guanxian County reached 28.719 billion yuan, an increase over the previous year at comparable prices.
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