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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.

Changbai Korean Autonomous County belongs to Baishan City, Jilin Province, located in the southeast of Jilin Province, the southern foot of Changbai Mountain, the right bank of the upper reaches of the Yalu River. It starts from 2 km east of Qidaogou estuary in the west, 2 km northeast of 23 Daogou estuary in the east, 92 km between east and west poles, 68 km between north and south poles from Nanjiantou Village and No. 3 demarcation point between China and North Korea, and borders Linjiang City by Yalu River and Qidaogou River in the west and northwest. The north border with Linjiang City and Fusong County, from the northeastbound of the Qidaogou River along the ridge of the Changbai Mountains to the No. 3 border pillar between China and North Korea, adjacent to Fusong County; from the southeast from the south side of the No. 3 boundary pile between China and North Korea, turn westbound along the Yalu River to Changbai Town to the right bank of the Qidaogou Estuary and the city of Linjiang; one city and five cities across the Yalu River and the Democratic people's Republic of Korea
Airport In Korean Autonomous County of Changbai - Baishan Changbaishan Airport
Baishan Changbaishan Airport (Baishan Changbaishan Airport, IATA: NBS, ICAO: ZYBS), referred to as "Changbaishan Airport", is located in Chixi District, Changbai Mountain Protection and Development Zone, Songjianghe Town, Fusong County, Baishan City, Jilin Province, China, 15.5 kilometers away from the county seat of Fusong County in the northwest It is 37 kilometers away from Changbai Mountain Tianchi in the east and 99 kilometers away from the center of Baishan City in the west. It is a 4D-level forest tourism feeder airport   .
On July 10, 2006, the construction of Baishan Changbaishan Airport started; on August 3, 2008, Baishan Changbaishan Airport was completed and open to navigation; in April 2018, the second phase of the reconstruction and expansion project of Baishan Changbaishan Airport started   .
As of April 2020, the terminal building of Baishan Changbaishan Airport covers an area of ​​9,256 square meters, with 2 boarding corridors; Class B seats; the runway is 2600 meters long and 45 meters wide   .
In 2021, Baishan Changbaishan Airport will handle a total of 272,168 passengers, a year-on-year increase of 24.8%, ranking 167th in the country; cargo and mail throughput is 56.8 tons, a year-on-year increase of 489.7%, ranking 191st in the country; Increased by 57.3%, ranking 185th in the country   .
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Travel Asks In Korean Autonomous County of Changbai