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  • Xizang、Tibet

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.

Tibet is called "Tibet" for short. The Tibet Autonomous region, the capital of Lhasa, is located on the southwest border of the people's Republic of China and is one of China's five ethnic minority autonomous regions. Tibet is located in the southwest of the Qinghai-Tibet Plateau, between 26 °50'N and 36 °53 °N, 78 °25'E and 99 °06'E, with an average elevation of more than 4000 meters. Tibet is known as the "roof of the world". The land area is 120218947.91 hectares, accounting for about 1% of the country's total area, second only to Xinjiang in all provinces, municipalities and autonomous regions. At the end of 2018, the resident population was 3.4382 million. Tibet is bordered by Xinjiang in the north, Sichuan in the east, Qinghai in the northeast and Yunnan in the southeast. It is bordered by Myanmar, India, Bhutan, Nepal, Kashmir and other countries and regions.
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