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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.

Hainan District is one of the municipal districts of Wuhai City, Inner Mongolia Autonomous region, located in the west of Inner Mongolia Autonomous region and the southeast of Wuhai City. East Yizhuozi Mountain (Wurendu Xiwula) is adjacent to Etok Banner in Ordos City, facing Wuda District across the Yellow River to the west, connecting four wells to the north and bordering Shizuishan City in Ningxia in the south. It is about 50 kilometers from north to south and 20 kilometers from east to west, with a total area of 1005 square kilometers. Hainan District has jurisdiction over 3 towns and 2 subdistrict offices. The total population in 2013 was 105000.
Airport In Hainan District - Wuhai Airport
Wuhai Airport (Wuhai Airport, IATA: WUA, ICAO: ZBUH), located on Airport Road, Haibowan District, Wuhai City, Inner Mongolia Autonomous Region, China, 12.5 kilometers south of Wuhai City Center, is a 4C-level domestic feeder airport in China   .
On March 25, 2002, Wuhai Airport started construction   ; On December 12, 2003, Wuhai Airport officially opened to traffic   ; On August 15, 2010, the new terminal of Wuhai Airport opened   .
As of April 2020, the terminal area of ​​Wuhai Airport is 12,480 square meters, with 3 boarding bridges; 7 seats on the station apron, including 5 class C seats and 2 class B seats; the runway is 2600 square meters long m, 45 m wide   .
In 2019, Wuhai Airport handled a total of 524,168 passengers, a year-on-year increase of 8.9%, ranking 140th in the country; cargo and mail throughput was 724.5 tons, a year-on-year increase of 9.9%, ranking 138th in the country; aircraft took off and landed 5,587 times, A year-on-year decrease of 1.9%, ranking 164th in the country  
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