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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.

Hubei Province, referred to as "E" for short, is the provincial administrative region of the people's Republic of China and the capital of Wuhan. It is located in central China, bordering Anhui in the east, Chongqing in the west, Shaanxi in the northwest, Jiangxi and Hunan in the south, and Henan in the north. It lies between latitude 29 °01: 53 "- 33 °6 °47" N and longitude 108 °21 °42 "- 116 °07 °50" E. it is about 740km long from east to west and 470km wide from north to south, with a total area of 185900 square kilometers, accounting for 1.94% of the total area of China. The eastern end is Huangmei County, the western end is Lichuan City, the southernmost end is Laifeng County, and the northernmost end is Yunxi County. The topography of Hubei Province is roughly surrounded by mountains in the east, west and north, low and flat in the middle, and slightly open to the south as an incomplete basin. In the total area of the province, mountains account for 56%.
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