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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.

Zaozhuang, a prefecture-level city of Shandong Province, is located in the south of Shandong Province, bordering Pingyi County, Fei County and Lanling County of Linyi City in the east, Tongshan District, Jiawang District and Pizhou City, Xuzhou City, Jiangsu Province in the south, Weishan County in Jining City in the west, and Weishan Lake in the north. Zoucheng City, Jining City in the north. Between longitude 116o 48km east and latitude 34 °27km, the width is 56 km from east to west and 96 km from north to south, with a total area of 4563 square km, accounting for 2.97% of the total area of Shandong Province. Zaozhuang, the city's resident, formed a village in the Tang and Song dynasties. It was named Zaozhuang because of its many jujube trees. It was officially used after the city was established in 1961. The terrain is high in the north and low in the south, high in the east and low in the west, tilting from northeast to southwest. The hills account for 54.6% of the total area, and the plains account for about 54.6% of the total area.
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