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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.

Dongguan, one of the prefecture-level cities under the jurisdiction of Guangdong Province, one of the central cities of the Pearl River Delta and one of the cities of Guangdong-Hong Kong-Macau Greater Bay Area, is a central city on the east coast of the Pearl River Delta approved by the State Council. By 2018, the city had jurisdiction over 4 streets and 28 towns, with a land area of 2460.1 square kilometers, a sea area of 82.57 square kilometers, a resident population of 8.3922 million, and an urban population of 7.6386 million, with an urbanization rate of 91.02%. Dongguan is located in the central and southern part of Guangdong Province, the east bank of the Pearl River Estuary, Guangzhou in the northwest, Shenzhen in the south and Huizhou in the northeast. Dongguan is the first of the "four little tigers of Guangdong" and is known as the "factory of the world". It is also one of the five prefecture-level cities without districts and one of the new first-tier cities in the country. Dongguan established a county during the period of the three Kingdoms.
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