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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.

Mangshi, known as "Chuan Huan" in Dai language, is the capital of Dehong Dai Jingpo Autonomous Prefecture, Yunnan Province, people's Republic of China. It is located between 98 °05 Longitude 98 °44km east longitude and 24 °05km north latitude, about 71 km from east to west and 62 km from north to south, with a total area of 2987 square kilometers. Longling County is bordered by Longling County in the east and northeast, Ruili City in the southwest, Lianghe County and Longchuan County in the west and northwest across the Longchuan River, and the Republic of the Union of Myanmar in the south. It is the transportation hub leading to Ruili, Longchuan, Yingjiang and Lianghe, and it is also an important gateway for China to South and Southeast Asia. In ancient times, Mangshi was the territory of the Dai nationality, which is inhabited by the Dai, Han, Jingpo, Deang, Achang, Lisu and other ethnic groups, with a total population of 3949.
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