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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.

Jianchang County, which belongs to Huludao City, Liaoning Province, is located in the northwest of Huludao City. It is bordered by Lianshan District and Xingcheng City in the east, Suizhong County in the south, Lingyuan City in the northwest, Azure Dragon Manchu Autonomous County and Haigang District in Qinhuangdao City, Hebei Province in the southwest, and Kazuo and Chaoyang counties in the north. Jianchang County has a total land area of 3181 square kilometers. Cultivated land is 890000 mu. The population of Jianchang County is 650000 (2011). There are Han, Manchu, Mongolian, Hui, Korean and other ethnic groups. Jianchang County is located in the hilly and mountainous areas of western Liaoning, where the Yanshan Mountains extend. The terrain is high in the northwest and low in the southeast. The Songling Mountains run northeast and southwest, running through the county. Daqingshan, the highest peak, is 1223 meters above sea level and is famous for its roofs in western Liaoning. There are more than 40 rivers that originate and flow through the county, and the main rivers are Daling River, Liugu River, Qinglong River and Heishui River. Within the territory, there are large,
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