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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.

Longxian, which belongs to Baoji City, Shaanxi Province, is called Longzhou in ancient times, because it is located in Dongzaka, Longshan. It is located in the west of Guanzhong Plain and northwest of Baoji City. It faces Qianyang to the east, Chencang District to the south and Qingshui, Zhangjiachuan, Huating, Chongxin and Lingtai five counties in the northwest. It is between longitude 106o 26mm 32 "- 107o 811" east and latitude 34o 35m 17 "- 35o 6m 45" N, with a width of 57.6km from north to south and 59.7km from east to west, with a total area of 2285 square kilometers. Longxian is called Longzhou in ancient times, because it is located on the east slope of Longshan. Qin Xianggong established the capital, and Longguan was established in the Han Dynasty, which is known as "the capital of Qin and Han pass". It is the first male pass on the ancient Silk Road to the west of Chang'an. Longxian County has a good ecology, with 60% forest coverage and 49 large and small rivers, which is known as the "faucet of Guanzhong".
Travel Guides In Longxian County
Travel Notes In Longxian County