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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.

Longxi County is located in the southeast of Gansu Province, in the middle of Dingxi City, in the upper reaches of Weihe River, in the middle of Longzhong Loess Plateau. It is connected with Tongwei County in the east, Wushan and Zhangxian in the south, Weiyuan County in the west and Anding District in the north. It belongs to Dingxi City, Gansu Province. Longxi gets its name because it is to the west of Longshan. Since ancient times, it has been the "country of the four Serbs", a place that must be fought for by military families. As far back as the prehistoric period, the ancestors thrived on this land, leaving cultural sites such as Yangshao and Qijia. King Zhao of Qin Dynasty established Longxi County in the 35th year (272 BC) and Xiangwu County in the early Han Dynasty. The Sui Dynasty changed to Longxi County, and the name of the county is still in use today. As of 2016, Longxi County covers an area of 2408 square kilometers and has jurisdiction over 10 towns, 7 townships, 215 administrative villages, 11 communities, 1287 village groups, with a total population of 519200.
Travel Guides In Longxi County
Travel Notes In Longxi County