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  • Yaozhou District

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.

Yaozhou District, which belongs to Tongchuan City, Shaanxi Province, is located on the southern edge of the Weibei Plateau in central Shaanxi, southwest of Tongchuan City, Xunyi County in the north, Sanyuan County in the south, Wangyi District and Yintai District in Tongchuan City in the northeast, Fuping County in the southeast and Chunhua County in the southwest. It is between 10834 miles east longitude and 109 degrees 06 east longitude and 34 degrees 48 miles north latitude and 35 degrees 19 degrees north latitude, with a total area of 1617 square kilometers. Yaozhou District, known as Yaoxian in ancient times, is the natural gateway from Guanzhong to northern Shaanxi, known as "Beishan lock key" and "Guanfu lapel throat". Yaozhou has a long history and profound cultural heritage. It used to be the ruler of Kangshi in ancient times, with a history of more than 2160 years. It was Sun Simiao, a medical scientist in the Sui and Tang dynasties, Fu Xuan, a philosopher in the Western Jin Dynasty, Liu Gongquan, a calligrapher in the Tang Dynasty, Linghu Deyi, a historian, and a landscape painter in the Northern Song Dynasty.
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