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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.

Laishan District, which belongs to Yantai City, Shandong Province, is located in the main urban area of Yantai City, bordering Muping District of Yantai City in the east and south, Fushan District of Yantai City in the southwest, Zhifu District of Yantai City in the northwest, and the Yellow Sea in the northeast. Between longitude 121o 1925 "- 121o 3329" east, latitude 37 °17050 "- 37 °31m 40" north, the maximum east-west distance of the area is 15.9km, and the maximum distance between north and south is 31km, with a total area of 285.43 square kilometers, of which land is 273.6 square kilometers, accounting for 95.9%; water area is 11.8square kilometers, accounting for 4.1 per cent. Laishan District temperate maritime climate characteristics are obvious, sunny, four distinct seasons, no cold in winter, no dry in summer, no hot heat in summer, superior natural environment. The beginning of air environmental quality
Airport In Laishan District - Yantai Penglai International Airport
Yantai Penglai International Airport (Yantai Penglai International Airport, IATA: YNT, ICAO: ZSYT), located in Chaoshui Town, Penglai District, Yantai City, Shandong Province, China, about 43 kilometers away from the center of Yantai, is a 4E-class civil transport airport and a national first-class aviation port   , Member of East China Airport Group   .
Yantai Penglai International Airport officially started construction on December 26, 2009. Its test flight was successful in November 2014, and it officially opened to traffic on May 28, 2015. According to the official website of the airport in February 2019, the airport has a domestic and international terminal area of ​​90,000 square meters, an apron covering an area of ​​400,000 square meters, a runway of 3,400 meters long, and 39 parking spaces, which can meet the needs of large-scale airports such as Boeing 747. The plane took off and landed safely.  
In 2019, the passenger throughput of Yantai Penglai International Airport exceeded 10 million   , an increase of 26.6% year-on-year; the cargo and mail throughput was 41,100 tons, a year-on-year decrease of 4.4%;  
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