• San Francisco
  • Tongguan District

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.

Tongguan District, which belongs to Tongling City, Anhui Province, is located in the southwest of Tongling City, named after Tongguanshan. East and southeast even the suburbs, west and Congyang County across the river, north Tongling County. The total area is 135 square kilometers. Tongguan District is the north gate of "two mountains and one lake", scenic spots-- Huangshan, Jiuhua Mountain and Taiping Lake, which gathers scientific and educational resources such as Tongling College, Tongling Vocational and Technical College, and Party School of the Municipal CPC Committee. It is the forward position and important carrier for Tongling to implement the strategy of "expanding from north to east". The cultural and natural landscapes include Tianjing Lake, Tongguanshan and Wumushan, which are national 4A tourist scenic spots. In 2018, Tongguan District has jurisdiction over 2 streets and 2 towns, and has another development zone with a resident population of 407000, achieving a GDP of 45.39469 billion yuan.
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