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  • Danyang

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.

Danyang, Zhenjiang City, Jiangsu Province, in charge of county-level cities, was called qu'an in ancient times, and got its name from the meaning of "Danfeng Chaoyang". Located in the Yangtze River Delta, located in the south of Jiangsu Province, belongs to the Taihu Lake basin. Danyang is one of the birthplaces of Wu culture. It was founded in the warring States period and is the hometown of Qi and Liang dynasties. Danyang culture belongs to Wu Yue culture, and the people of Danyang belong to the people of Jiangsu and Zhejiang provinces. Rivers crisscross in Danyang, 122 Provincial Highway, 312 National Highway, Shanghai-Nanjing Expressway, Zhendan Expressway, Beijing-Shanghai Railway, Beijing-Shanghai High-speed Railway, Shanghai-Nanjing Intercity Railway, Beijing-Hangzhou Grand Canal. In 1987, it was approved by the State Council to withdraw counties and build cities, and was listed as a coastal open city. Danyang is the world's largest lens production base, known as the "hometown of Chinese glasses" Meiji. The economic strength of Danyang ranks No. 1 in the comprehensive competitiveness of county-level cities in China in 2013.
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