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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.

Qianzhong, known as Baoning in ancient times, is a county-level city hosted by Nanchong City, Sichuan Province. it is located in the northeast of Sichuan Basin, in the middle reaches of Jialing River, at the southern foot of Qinba Mountain, surrounded by mountains and water in three directions. It is bordered by Bazhong City and Yilong County in the east, Nanbu County in the south, Jiange County in the west and Cangxi County in the north. For more than 2000 years, it has been an important military town for Bashu. Langzhong City covers an area of 1878 square kilometers and has jurisdiction over 5 streets, 19 towns and 4 townships, with a total population of 859192 (2016). It is a demonstration city of ecological construction in China, an excellent tourist city in China, a thousand-year-old county in the world, and the hometown of Chinese Spring Festival culture. Yuanzhong is known as "Langyuan Wonderland" and "Ba-Shu wants to rush". Du Fu, a poet of the Tang Dynasty, left a famous saying here that "the world is rare in the south of Langzhou". The territory is home to China's four most well-preserved
Travel Guides In The Ancient City of Langzhong
Travel Sights In The Ancient City of Langzhong
Travel Notes In The Ancient City of Langzhong