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  • Yangshan

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.

Yangshan County, which belongs to Qingyuan City, Guangdong Province, is located in the northwest of Guangdong Province, the middle part of Qingyuan, the southern foot of Nanling Mountains and the middle reaches of Lianjiang River. it is located between longitude 112 °22 °01mm east and latitude 23 °58470 °24 °5552' north. It is one of the 21 key counties of poverty alleviation and development in Guangdong Province. There was Yangyu State in the warring States period, Yangshanguan was established at the end of the Qin Dynasty, and Yangshan County was located in Gaozu of the Western Han Dynasty, which has a history of more than 2200 years. The county has a total area of 3418 square kilometers and has jurisdiction over 12 towns and one Yao township. As of 2018, Yangshan County has a total population of 569000. Yangshan County, 160 kilometers away from Guangzhou, is an important part of the "two-hour life circle" in the Pearl River Delta. The waterway is convenient. Lianjiang flows through the county from north to south, all the year round.
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