• San Francisco
  • Yuzhou

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.

Yuzhou City, referred to as "Jun", in ancient times known as "Xiayi", "Yangzhai", "Junzhou", Henan Province under the jurisdiction of county-level cities. Yuzhou City, with a total area of 1461 square kilometers and a central urban area of 114square kilometers, is located in the middle of Henan Province and is the central city on the southern edge of the Central Plains urban agglomeration. at the end of 2016, Yuzhou has a total population of 1.29 million and a resident population of 470000. Yuzhou is one of the birthplaces of the Chinese nation, the capital of the Xia Dynasty, the first slave dynasty in China, the only producing area of Jun porcelain, one of the five famous porcelain in China, and one of the four distribution centers of traditional Chinese medicine in the Ming and Qing dynasties. It is known as "Xia Capital", "Jun Capital" and "Medicine Capital". It was named as the first batch of famous historical and cultural cities in Henan Province in 2011 and the "hometown of Chinese Dayu Culture" in 2007.
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