• San Francisco
  • Dangshan/Tangshan

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.

Dangshan, which belongs to Suzhou City, Anhui Province, is called Xiayi in ancient times. It is located at the northernmost end of Anhui Province, at the junction of Anhui, Jiangsu, Shandong and Henan provinces and seven counties, and is connected to Xiao County of this province in the southeast. It is adjacent to Yongcheng City, Xiayi County and Yucheng County of Henan Province from south to west; it is connected with Shan County of Shandong Province in the northwest and Feng County of Jiangsu Province in the northeast. The total area is 1193 square kilometers. Dangshan has a long history and rich resources. It has been built for more than 2200 years since Xiayi County was built in Qin Dynasty. Dangshan is known as the "pear capital of the world" and is known as "the hometown of crisp pears in China". In April 2010, it was recognized by Guinness Book of Records as the largest continuous orchard production area in the world. It is "the hometown of Chinese martial arts" and "the hometown of Chinese suona". It is the hometown of Zhu Wen, the founding emperor of the later Liang Dynasty. By 2018, there were 13 towns under the jurisdiction of Dangshan County.
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