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Columbus (/kəˈlʌmbəs/) is the state capital and the most populous city in the U.S. state of Ohio. With a 2020 census population of 905,748, it is the 14th-most populous city in the U.S., the second-most populous city in the Midwest, after Chicago, and the third-most populous state capital. Columbus is the county seat of Franklin County; it also extends into Delaware and Fairfield counties. It is the core city of the Columbus metropolitan area, which encompasses 10 counties in central Ohio. The metropolitan area had a population of 2,138,926 in 2020, making it the largest entirely in Ohio[a] and 32nd-largest in the U.S.

Columbus originated as numerous Native American settlements on the banks of the Scioto River. Franklinton, now a city neighborhood, was the first European settlement, laid out in 1797. The city was founded in 1812 at the confluence of the Scioto and Olentangy rivers, and laid out to become the state capital. The city was named for Italian explorer Christopher Columbus. The city assumed the function of state capital in 1816 and county seat in 1824. Amid steady years of growth and industrialization, the city has experienced numerous floods and recessions. Beginning in the 1950s, Columbus began to experience significant growth; it became the largest city in Ohio in land and population by the early 1990s. The 1990s and 2000s saw redevelopment in numerous city neighborhoods, including Downtown.

Yunyan District, which belongs to Guiyang City, Guizhou Province, is located in the north of the north-south "boat basin" of Guiyang City. It is located in the north half of Guiyang City, bordering Wudang District and Guanshan Lake District on the east, west and north, bordering Nanming District in the south and Baiyun District in the northwest. It is 17.5 km long from east to west, 12.5 km wide from north to south, and covers an area of 93.57 square kilometers. The total population is 950000 (2012). Yunyan District is one of the central urban areas of Guiyang City, the main part of the old city of Guiyang, and the resident area of the people's Government of Guizhou Province. In 2013, Yunyan District took the lead in breaking through 50 billion yuan in GDP, 30 billion yuan in fixed assets investment and 1 percent in total financial revenue.
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