• San Francisco
  • Yanshan County

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.

Yanshan County belongs to Cangzhou City, Hebei Province, with a total area of 800 square kilometers, located in the southeast of Cangzhou City, facing the Bohai Sea to the east, Beijing and Tianjin to the north and Shandong to the south. It is the center of the "two provinces" (Hebei Province and Shandong Province) and "three cities" (Cangzhou, Dezhou and Binzhou). It is known as "Jilu Hub" and "Beijing-Tianjin Portal". It is 120 kilometers away from Tianjin, 220 kilometers from Beijing, 160 kilometers from Jinan, 50 kilometers away from Huanghua Port and 110 kilometers away from Tianjin Port. You can go to sea in half an hour and board the plane in one hour. Yanhuang Railway, New Beijing-Shanghai Expressway, 205 National Highway and other national trunk lines run through the county, and the three major railway lines of Beijing-Kowloon Railway, Beijing-Shanghai Railway (passenger dedicated line) and Shuohuang Railway pass by the major traffic arteries such as Shihuang Expressway and Tianjin-Shantou Expressway. The total area of the county is 800 square kilometers, with cultivated land.
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