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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.

Jiange County, which belongs to Guangyuan City, Sichuan Province, is located at the northern edge of Sichuan Basin, the junction of Sichuan, Shaanxi and Gansu provinces, located in the north of Sichuan Province and the southwest of Guangyuan City, guarding the natural danger of Jianmen. "Jiange is towering and towering into the clouds, as long as it is guarded by one person, thousands of troops are difficult to capture." it is known as "the Golden Triangle of Northern Sichuan" and "the Pearl of Shu Road". The county covers an area of 3204 square kilometers and has jurisdiction over 27 towns and 30 townships, with a total registered population of 657700 at the end of 2017. Dangde County was first established at the end of the Eastern Han Dynasty, and Nanan County was set up in Pu'an Town in the Northern and Southern dynasties during the Liu Song Dynasty. After the reform, Jianzhou was changed to Jiange County in 1913, and the county seat moved to Xiasi Town in September 2003. The work of withdrawing counties and building cities was officially launched in April 2015, and it is planned to complete the declaration of Jianmenguan City at the county level in 2017. Beijing and Kunming
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