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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.

Donggang District belongs to Rizhao City, Shandong Province. Bordering the Yellow Sea, it is located in the middle of the Chinese mainland coastline, with the south wing of Shandong Peninsula, Qingdao to the north and Lianyungang to the south, facing Japan and South Korea across the sea. The total area is 1507 square kilometers. Donggang District, founded in December 1992, is the resident area and main urban area of Rizhao City. It is located at the confluence of the coastal main axis developed by the state and the economic belt along the new Eurasian Continental Bridge, and the combination of the economic circle around the Yellow Sea and Bohai Sea and the economic circle of the Yangtze River Delta. It is an important node city of the national "Belt and Road Initiative" strategic planning and the "two zones, one circle" strategy of Shandong Province. In 2018, Donggang District has jurisdiction over 5 streets and 7 towns, with a total registered population of 741800, with a gross domestic product (GDP) of 57.04 billion yuan, of which the primary industry is realized.
Airport In Donggang Area - Rizhao Shanzihe Airport
Rizhao Shanzihe Airport (IATA: RIZ, ICAO: ZSRZ) is referred to as Rizhao Airport; it is located in Shanzihe, Houcun Town, Donggang District, Rizhao City, Shandong Province, China, 19 kilometers away from the center of Rizhao.  
Rizhao Shanzihe Airport was officially opened to navigation on December 22, 2015, and was named Rizhao Shanzihe Airport.  
According to the information on the airport's official website in March 2019, Rizhao Shanzihe Airport has a terminal building, T1 (domestic and international in China), with a total area of ​​22,000 square meters; a runway with a length of 2,600 meters; and 6 parking spaces , Cargo flat 3789 square meters   ; It can guarantee an annual passenger throughput of 900,000 person-times, a cargo and mail throughput of 4,500 tons, and an aircraft take-off and landing of 10,000 sorties   ;As of October 2019, Rizhao Shanzihe Airport has opened a total of 15 domestic routes in China and 21 navigable cities   .
In 2018, the passenger throughput of Rizhao Shanzihe Airport was 901,200 passengers, a year-on-year increase of 22.2%; the cargo and mail throughput was 1,400 tons, a year-on-year increase of 41.1%; the number of takeoffs and landings was 79,500 vehicles, a year-on-year increase of 83.4%; 101st, 99th, 44th.  
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