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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.

Henan Mongolian Autonomous County is the only Mongolian Autonomous County in Qinghai Province, commonly known as "Henan Mengqi", which has the highest proportion of Mongolian population in China. It is located in the southeast of Qinghai Province, facing Xiahe County and Luqu County of Gannan Tibetan Autonomous Prefecture of Gansu Province to the east, Maqu County of Gannan Tibetan Autonomous Prefecture of Gansu Province to the south, Maqin County of Guoluo Tibetan Autonomous Prefecture of Qinghai Province and Tongde County of Hainan Prefecture in the southwest, adjacent to Zeku County in the north, located in the joint of three provinces of Qinghai and Gansu, known as the south gate of Qinghai Province. The county covers a total area of 6997.45 square kilometers and is 3600 meters above sea level. It has jurisdiction over one town, four townships, two communities, 39 animal husbandry committees, 135 animal husbandry cooperatives and four Tibetan Buddhist monasteries. As of 2011, the total population was 40, 000, of which 93.21% were Mongolians. Henan County is the largest organic animal husbandry student in China.
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