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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.

Peixian, referred to as "Pei" for short, gets its name from "Peize" in ancient times. Xiazhou County, Xuzhou City, Jiangsu Province, is located in the northwest of Xuzhou City, at the junction of Jiangsu and Shandong provinces, Weishan Lake in the east, Feng County in the west, Tongshan District in the south and Yutai in Shandong Province in the north. it is located at the southeast edge of the North China Plain and the northwest of the Huaihai Economic Zone. The total area is 1576 square kilometers and the total population is 1.3 million (2016). In 2016, the regional GDP reached 66.5 billion yuan, an increase of 9.1%. Peixian is a waterfront city and green capital. Peicheng is less than 5 kilometers east of Weishan Lake, the largest freshwater lake in northern China, and has 62 kilometers of lake shoreline and 400 square kilometers of lake surface. With a long history and rich resources, Peixian is the main coal producing area in Jiangsu Province and East China, with proven coal reserves of 2.4 billion.
Airport In Pei County - Xuzhou Guanyin International Airport
Xuzhou Guanyin International Airport (Xuzhou Guanyin International Airport, IATA: XUZ, ICAO: ZSXZ), located in Shuanggou Town, Suining County, Xuzhou City, Jiangsu Province, 45 kilometers away from Xuzhou City, is a 4E-level civil international airport   , is the central airport of Xuzhou Metropolitan Circle and Huaihai Economic Zone.  
Xuzhou Guanyin International Airport was officially opened to navigation on November 8, 1997; it was named Xuzhou Guanyin Airport   ;Renamed to Xuzhou Guanyin International Airport on January 6, 2016   ; On June 8, 2018, the second phase of the expansion project was completed.  
As of January 2019, Xuzhou Guanyin International Airport has two terminals, T1 (international and Hong Kong, Macao and Taiwan) and T2 (China domestic), with a total area of ​​58,000 square meters; there is a runway with a length of 3,400 meters; the apron is 6.3 10,000 square meters, 9 seats   ; As of October 2019, a total of about 39 domestic and international routes have been opened in China   , 39 navigable cities.  
In 2019, the passenger throughput of Xuzhou Guanyin International Airport was 3,005,875 passengers, a year-on-year increase of 19.3%; the cargo and mail throughput was 12,068 tons, a year-on-year increase of 19.9%; the number of take-offs and landings was 49,648, a year-on-year increase of -%; ranking 55th in China respectively , 52nd, and 60th.  
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