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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.

Huan Tai is a county under the jurisdiction of Zibo City, which is located in the combination zone of the mountain area of central Shandong Province and the northern part of Lubei Plain. it is located in the north of Shandong Province, north of Zibo City, between latitude 36 °51 °50 "- 37 °06 °00" north and longitude 117 °50 "- 118 °10 °40" east, bordering Boxing and Gaoqing counties in the north, Linzi District in the east, Zhangdian District and Zhoucun District in the south and Zouping County in the west. The county covers an area of 509 square kilometers. The terrain in Huantai County is high in the south and low in the north, tilting from southwest to northeast, slightly in the shape of microwave. It is located in the warm temperate continental monsoon climate. As of 2015, Huantai County has one national AAAA tourist area, two national AAA tourist areas and one famous Chinese historical and cultural town. As of 2015, Huantai County has jurisdiction over 2 streets and 7
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