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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.

Wudi County, which belongs to Binzhou City, Shandong Province, is located in the northernmost part of Shandong Province, located on the coast, bordering Bohai Bay in the northeast, Zhanghua District in the southeast, Yangxin County in the south, Qingyun County in Dezhou City in the west, and Haixing County and Huanghua City in Hebei Province by Zhangwei River in the north. It is located between 37 °4 degrees north latitude and 38 degrees 16 miles north latitude and 118o 04 degrees east longitude, with a total area of 1961 square kilometers. Wudi County is the intersection of the two major economic zones of Beijing, Tianjin and Shandong Peninsula, known as "Hebei-Shandong hub" and "Qiyan fortress". It is not only the key area for the comprehensive development of the Yellow River Delta, but also the forward position for the construction of "Shandong at Sea". In 2018, Wudi County has jurisdiction over 2 streets and 10 towns with a total registered population of 456100, achieving regional gross domestic product (GDP).
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