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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.

Ziyang, a prefecture-level city in Sichuan Province, Ziyang County under the jurisdiction of ancient Zizhou (current capital), ancient writers Kui Hong, Dong Jun and Wang Bao are also known as the "three sages of Ziyang". Lezhi is the hometown of Marshal Chen Yi, the founding father of the country. It is located in the middle of Sichuan Basin, adjacent to the Neijiang River in the south, Chengdu and Deyang in the north, Chongqing and Suining in the east and Meishan in the west. It is the only regional central city in Sichuan Province that connects the "double core" of Chengdu and Chongqing at the same time. Ziyang County in the Western Han Dynasty in 135 BC, followed by states and counties, has a history of more than 2100 years. 35000 years ago, the ancient "Ziyang people" opened the history of human civilization in Sichuan. On February 26, 1998, Ziyang District was established with the approval of the State Council, and on June 14, 2000, Ziyang District was abolished with the approval of the State Council.
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