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  • Shaanxi

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.

Shaanxi, referred to as "Shaanxi" or "Qin", the provincial administrative region of the people's Republic of China, the provincial capital Xi'an, is located in the hinterland of China, the middle reaches of the Yellow River, Shanxi and Henan to the east, Ningxia and Gansu to the west, Sichuan, Chongqing and Hubei to the south and Inner Mongolia to the north, between longitude 105 °29 and latitude 31 °42, with a total area of 205600 square kilometers. China's longitude and latitude reference point, geodetic origin, and Beijing time National time Service Center are located in the province. The topography of Shaanxi Province is high in the north and low in the middle, and is composed of plateaus, mountains, plains and basins, among which the Loess Plateau accounts for 40% of the province's land area, straddling the two major river systems of the Yellow River and the Yangtze River, and across three climatic belts. The Great Wall in northern Shaanxi belongs to the mid-temperate monsoon climate, Guanzhong and
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