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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.

Qimen County belongs to Huangshan City, Anhui Province. It is located at the western foot of Huangshan Mountain, bordering Yixian County in the northeast, Xiuning County in the southeast, Shitai and Dongzhi County in the northwest, the province in the southwest and Jiangxi Province in the southwest. The total area is 2257 square kilometers. Qimen County is the south gate of Anhui Province, belonging to the "one prefecture and six counties" of ancient Huizhou, which was founded in the second year of Tang Yongtai (766). Because the city has Qishan in the northeast and Ximen in the southwest, it is a mountain county with "nine mountains, half water and half fields". Qimen tea production has a long history, as early as the Tang Dynasty, there is a very prosperous tea market, is the "hometown of black tea in China". In 2018, Qimen County has jurisdiction over 10 towns and 8 townships, with a resident population of 163000. The gross domestic product (GDP) reached 6.8344 billion yuan, of which the added value of the primary industry was 659.07 million yuan.
Airport In Qimen County - Huangshan Tunxi International Airport
Huangshan Tunxi International Airport (Huangshan Tunxi International Airport; IATA: TXN, ICAO: ZSTX), located in Tunxi District, Huangshan City, Anhui Province, China, 5.5 kilometers away from the central city, is a 4D civil transport airport   .
Huangshan Tunxi International Airport opened to traffic in October 1959 and was named Tunxi Airport. It was renamed Huangshan Tunxi Airport in 1987 and was renamed Huangshan Tunxi International Airport in June 2014. The first phase of the expansion project was carried out in 1966 and completed in 1980. The second phase of the expansion project, the third phase of the expansion project in 1987, the fourth phase of the expansion project in July 2000, and the fifth phase of the expansion project in 2017   .
According to information on the airport's official website in May 2019, Huangshan Tunxi International Airport has a terminal building, T1 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​14,000 square meters; a total of 1 runway with a length of 2,600 meters; apron 49,000 square meters, 8 aircraft seats; can guarantee an annual passenger throughput of 1.12 million person-times   . According to the information on the airport's official website in May 2019, there are 24 domestic and international navigation cities in China.  
In 2020, due to the decline due to the impact of the global epidemic, the passenger throughput of Huangshan Tunxi International Airport was 444,200, a year-on-year decrease of 48.9%; the cargo and mail throughput was 1,300 tons, a year-on-year decrease of 32.6%; The need to drop by 40.5%; ranking 129th, 103rd, and 149th in China respectively. In 2019, they ranked 114th, 94th, and 130th in China respectively   .
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