• San Francisco
  • Langya

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.

Langya District, which belongs to Chuzhou City, Anhui Province, was named Langya District because of Langya Mountain and the original Langya Township in Chuzhou. It was established on January 18, 1993. It is located in the east of Anhui Province, the north bank of the lower reaches of the Yangtze River, the southeast of Chuzhou, about 50 kilometers southeast of Nanjing and 100 kilometers west of Hefei, the provincial capital. The region covers an area of 180.79 square kilometers and has a resident population of 310000. By the end of 2013, it had jurisdiction over 10 directly administered communities and provincial-level Langshan Economic Development Zone. The area belongs to the north subtropical monsoon climate, the annual average temperature is 15.2 degrees Celsius, and the air quality reaches the national second-class standard all the year round. The main scenic spots are Langya Mountain Scenic spot, Zuiweng Pavilion, Fengle Pavilion, Xijian Lake, Qingliu River and so on. Langya District is a member of "Yangtze River Delta Urban agglomeration" and one of the core areas of "Nanjing Metropolitan area".
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