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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.

Luqu County, which belongs to Gannan Tibetan Autonomous Prefecture of Gansu Province, is located in the southwest of Gannan Tibetan Autonomous Prefecture, the eastern edge of the Qinghai-Tibet Plateau, and the junction of Gansu, Qinghai and Sichuan provinces. The geographical coordinates are 101 °35 "36" to 102 °58 "15" east and 33 °58 "21" to 34 °48 "north latitude. As of October 2018, Luqu County has jurisdiction over 5 towns and 2 townships, with a total area of 5298.6 square kilometers and a resident population of 38000. Luqu County was officially established in June 1955. The main specialties of Luqu County are Tibetan mastiff and fern hemp pig. Zecha Stone Forest in Luqu County is not only one of the three famous tourist attractions in the county, but also a famous tourist attraction in Gannan Autonomous Prefecture and even Gansu Province. In 1998, Zecha Stone Forest was listed as a national nature reserve together with Gahai Lake.
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