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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.

Yiyang, located in the northeast of Jiangxi Province, in the middle reaches of Xinjiang, is located in Shangrao City. The county is 27 kilometers wide from east to west and 76 kilometers from north to south, with a total area of 1593 square kilometers. There are 10 towns, 5 townships and 2 streets with a registered population of 425600. The built-up area of the county is 13.5 square kilometers, with a resident population of more than 115000. Jurisdiction over 9 towns, 5 townships and 1 subdistrict office. The hometown of revolutionary martyr Fang Zhimin. The topography of Yiyang County is high in the north and south and low in the middle, forming the Yiyang basin. The rivers in the territory belong to the Xinjiang River and Raohe River systems. It belongs to the humid climate of the subtropics.
Airport In YiYang County - Shangrao Sanqingshan Airport
Shangrao Sanqingshan Airport (Shangrao Sanqingshan Airport, IATA: SQD, ICAO: ZSSR), located in Houmentang at the junction of Zunqiao Township, Zaotou Town, Guangxin District, Shangrao City, Jiangxi Province, and Maojialing, Xinzhou District, Shangrao City, from the center of Shangrao With a straight-line distance of 8 kilometers, it is a 4C-level feeder airport and the seventh civil airport in Jiangxi Province.
Shangrao Sanqingshan Airport was built on July 8, 2012 and officially opened to navigation on May 28, 2017.
According to comprehensive information in May 2017, Shangrao Sanqingshan Airport covers an area of ​​2,243 acres, with a total investment of about 800 million yuan. The runway is 2,400 meters long and 45 meters wide, with 6 seats.  
In 2019, the passenger throughput of Shangrao Sanqingshan Airport was 500,156; the cargo and mail throughput was 153.8 tons; the number of takeoffs and landings was 5,982; ranking 144th, 181st, and 154th in China respectively.  
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