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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.

Zhen'an County is one of the buildings under the jurisdiction of Shangluo City, Shaanxi Province. Located in southeastern Shaanxi Province, the southern foot of Qinling Mountains, southwest of Shangluo City, Han River tributaries Qianyou River and the middle reaches of Xunhe River, 175.5 kilometers from east to west, 72.5 kilometers wide from north to south, with a total area of 3477 square kilometers. The terrain is high in the northwest, low in the southeast, with many mountains and ditches and little arable land. It is an earth-rocky mountain area with "nine mountains and half water and half divided fields". Zhenan County is a national science popularization experimental county, a national medical reform pilot county, a garden city in Shaanxi Province, and a sanitary county in Shaanxi Province. Zhenan chestnut is famous for its large color, sweet and delicious, full grains, rich nutrition and unique quality, and is known as "the hometown of Chinese chestnut". Since ancient times, Xi'an is the main road to Ankang, is the natural link between Shaanxi and Hubei, known as "Qin Chu throat". 2019
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