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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.

Aihui District is the only municipal district in Heihe City. The old name "Jianyu", located in the northeast of Heilongjiang Province, at the northern foot of Xiaoxinganling, is the seat of Heihe Municipal Party Committee and Municipal Government, and the political, economic, cultural, educational and medical center of Heihe City. Aihui District covers an area of 14446 square kilometers and has jurisdiction over 4 streets, 3 towns and 8 townships. There are 16 state-owned agriculture, forestry and pastures with a total population of 197000. There are 26 ethnic groups, including Han, Manchu, Daur, Oroqen and so on. It is an important gateway for China to open to Northeast Asia. the country's first open cities along the border, national ecological demonstration areas and restricted development zones in the Xing'an Mountains; one of the birthplaces of the first ancestors of the Qing Dynasty The first Heilongjiang general Yamen resident; the Daur nationality moved south across the river; the northern starting point of the geographical dividing line of population between Tengchong and Tengchong.
Airport In Aihui District - Heihe Aihui Airport
Heihe Aihui Airport (Heihe Aihui Airport, IATA: HEK, ICAO: ZYHE), located in the camp of the third team of New Life, Airport Road, Aihui District, Heihe City, Heilongjiang Province, China, 15 kilometers away from Heihe city center in the northeast, is a 4C-level China Domestic Regional Airport   .
In 1933, Heihe Airport began to implement military and civilian use; on September 30, 2001, Heihe Airport resumed operations   ; In 2003, the new terminal of Heihe Airport was opened   ; In March 2016, Heihe Airport officially changed its name to Heihe Aihui Airport   .
As of August 2020, the terminal building of Heihe Aigun Airport covers an area of ​​5,800 square meters, with 1 boarding gate; 4 C-class aircraft seats on the civil aviation platform; the runway is 2,500 meters long and 45 meters wide; it can meet the annual passenger Throughput of 113,200 person-time usage requirements       .
In 2019, Heihe Aihui Airport handled a total of 215,947 passengers, a year-on-year increase of 19.4%, ranking 187th in the country; cargo and mail throughput was 35.8 tons, a year-on-year decrease of 26.8%, ranking 201st in the country; aircraft took off and landed 2,730 sorties , down 11.4% year-on-year, ranking 197th in the country   .
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