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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.

Dongning City is a county-level city directly under the jurisdiction of Heilongjiang Province and managed by Mudanjiang City. Dongning City is located in the southeast of Heilongjiang Province, bordering Russia in the east and adjacent to Wangqing County, Yanbian Korean Autonomous Prefecture and Hunchun City, Yanbian Korean Autonomous Prefecture in the south. Dongning City is located in the southeast of Heilongjiang Province with longitude of 129 °53 miles east longitude and 43 °25 degrees north latitude. It is an important transportation hub on the international corridor of Northeast Asia. It is a national first-class land port. Dongning was established at the end of the Qing Dynasty, and in December 2015, Dongning withdrew its county and set up a city. Dongning City has a total area of 7139 square kilometers, with a geomorphology of "nine mountains, half water and half land". It has jurisdiction over six towns with a population of 210000 (2014). The climatic condition is temperate continental monsoon climate. 2014, Dongning
Airport In Dongning - Mudanjiang Hailang International Airport
Mudanjiang Hailang International Airport (Mudanjiang Hailang International Airport, IATA: MDG, ICAO: ZYMD), located in the southwest suburb of Mudanjiang City, Heilongjiang Province, China, 9 kilometers away from the center of Mudanjiang, is a 4C-level military-civilian joint international feeder airport and one of the country's opening-up class air port   .
On September 2, 1985, Mudanjiang Hailang Airport was officially open to navigation; in December 1998, Mudanjiang Hailang Airport was officially opened to the public with the approval of the State Council; on August 21, 2017, Mudanjiang Hailang Airport was officially renamed as Mudanjiang Hailang International Airport   .
As of February 2020, the terminal area of ​​Mudanjiang Hailang International Airport is 8,200 square meters, with 2 boarding gates; the area of ​​the civil aviation station is 38,000 square meters, with 4 seats; one is 2,600 meters long and 45 meters wide The asphalt runway can take off and land Boeing B737-800 and below; it can meet the needs of annual passenger throughput of 500,000 passengers   .
In 2019, Mudanjiang Hailang International Airport handled a total of 1,048,088 passengers, a year-on-year increase of 12.2%, ranking 103rd in the country; cargo and mail throughput was 1,290.0 tons, a year-on-year increase of 4.3%, ranking 112th in the country; aircraft took off and landed 8,128 sorties , a year-on-year increase of 8.9%, ranking 139th in the country   .
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