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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.

Mado, which means "the source of the Yellow River" in Tibetan, is located in the northwest of Guoluo Tibetan Autonomous Prefecture in Qinghai Province, in the south of Qinghai Province, in the northwest of Guoluo Tibetan Autonomous Prefecture, and belongs to Guoluo Tibetan Autonomous Prefecture. Mado County is bordered by Dulan County, Haixi Mongolian Autonomous Prefecture in the north, Xinghai County in Hainan Tibetan Autonomous Prefecture and Maqin County in Guoluo Tibetan Autonomous Prefecture in the east, Dari County in Guoluo Tibetan Autonomous Prefecture and Shiqu County in Sichuan Province in the south, Qumalai County in Yushu Tibetan Autonomous County in the west, and Yushu Tibetan Autonomous Prefecture in the southwest. It is 207km wide from north to south and 228km long from east to west, with a total area of 25253 square kilometers. The average altitude is more than 4200 meters, and the annual average temperature is-4 ℃, which belongs to alpine steppe climate. Lake Eling, Lake Zaling, Lake Donggezona, Xingjinghai,
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Hoh Xil has finally come true.
foreword D1, fly from Guangzhou to Xining, rent a car and drive to Huzhu Tu Nationality Homeland Park, Sumenyuan D2, Menyuan Rapeseed Flowers, back