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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.

Ouhai District, Wenzhou Municipal District of Zhejiang Province, is one of the four major urban areas of Wenzhou. In ancient times, Ouhai belonged to "Oudi", with a land area of 466.46 square kilometers, accounting for 40.2% of the urban land area of Wenzhou and 4.0% of the city's land area. The county was established in 1981 and was withdrawn from the county in 1992, with 12 streets, 1 town, 1 provincial development zone, 251 administrative villages and 85 communities, with a total population of 996900 (2010). Ouhai District has successively won the honorary titles of advanced areas in China's scientific and technological work, strong provincial education, provincial civilized urban areas, provincial peace and security areas, provincial scientific and technological strong areas, provincial community health service advanced areas, provincial double-support model cities, provincial rural grass-roots organizations "Vanguard Project" construction advanced areas, provincial sports strong areas and other honorary titles. two hundred and one
Airport In Ouhai District - Wenzhou Longwan International Airport
Wenzhou Longwan International Airport (Wenzhou Longwan International Airport, IATA: WNZ, ICAO: ZSWZ), located in Longwan District, Wenzhou City, Zhejiang Province, China, is on the verge of the East China Sea and is about 22 kilometers away from the city center. It is a 4E-class civil international airport and a national first-class airline. Ports, China's domestic second-class civil airports.  
Wenzhou Longwan International Airport was formerly known as Wenzhou Yongqiang Airport, which was officially opened to navigation on July 12, 1990, and changed to its current name in March 2013.   In November 2011, the construction of the T2 terminal of the airport officially started.   On August 9, 2013, the new runway of the airport passed the inspection.  
As of June 2018, Wenzhou Longwan International Airport has two terminals, namely T1 (international) and T2 (domestic), with a total area of ​​129,500 square meters; it has an apron of 534,000 square meters and 59 parking positions. There are 29 airport bridges; a runway with a length of 3,200 meters and a width of 45 meters (including a shoulder of 60 meters), which can meet the capacity requirements of an annual passenger throughput of 15 million passengers; 125 operating routes, including 16 international (regional) routes.   As of November 2018, the airport has accumulatively served 133 cities, including 29 international (regional) cities.  
In 2017, the passenger throughput of Wenzhou Longwan International Airport was 9.2856 million passengers, a year-on-year increase of 13.4%; the cargo and mail throughput was 75,500 tons, a year-on-year decrease of 2.9%; No. 31, 42.   
In 2018, the annual passenger throughput of Wenzhou Airport exceeded 10 million for the first time, successfully entering the ranks of large international airports with tens of millions. In 2019, Wenzhou Airport completed 92,300 flight movements, 12,291,700 passenger throughput, and 81,100 tons of cargo and mail throughput, a year-on-year increase of 6.87%, 9.56%, and 1.14%, respectively.  
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