• San Francisco
  • Tianmen

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.

Tianmen, known as Jingling in ancient times, is a municipality of Hubei Province, an important member of Wuhan City Circle and the urban agglomeration in the middle reaches of the Yangtze River, and the main node cities in the Han River Basin, located in the middle of Hubei Province and the north of Jianghan Plain, reaching Dahongshan in the north, Hanjiang River in the south and Wuhan in the east. In the fourth year of Emperor Yongzheng of the Qing Dynasty (1726), Tianmen Mountain was named "Tianmen". In 1994, the State Council approved Tianmen City to be directly under the jurisdiction of Hubei Province. In 2018, the city's resident population was 1.2723 million. Tianmen is an important birthplace of world tea culture, the hometown of Lu Yu, the largest hometown of overseas Chinese in the interior, and the hometown of steamed vegetables in China. It is a national sanitary city and a national garden city. It ranks among the top 100 county economies in the country and has been rated as one of the top 100 county economies for 12 consecutive years.
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