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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 District, which belongs to Yiyang City, Hunan Province, is located in the north of the central city of Yiyang City, facing Changsha-Zhuzhou-Xiangtan Urban agglomeration to the east and Changde Hanshou County to the west, with a population of 423000 and an area of 680sq km. It has jurisdiction over five towns, one township, two subdistrict offices and one provincial industrial park (Changchun Economic Development District). Ziyang is an important transportation hub and material distribution center in central and northern Hunan, and it is the "key place to undertake the gradient transfer of processing trade" approved by the Ministry of Commerce. The region has formed four major industrial clusters dominated by equipment manufacturing, electronic information, light industrial textiles and agricultural products (food) processing, communications, electric power and other infrastructure have developed rapidly, and land and water transportation has formed a dense network. Ziyang District is a national ecological construction demonstration area, the national Dongting Lake Wetland Ecological Reserve, and it is also one of the two provincial counties with excellent environmental quality in Hunan Province. Guan Yunchang
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