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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.

Dongchuan District, belonging to Kunming City, Yunnan Province, is located in the northeast of Yunnan Province and the northernmost end of Kunming City, 150km away from Kunming, adjacent to Huize County, Qujing City, Yunnan Province in the east, Xundian County, Kunming City in the south, Luquan County, Kunming City in the west, Qiaojia County, Zhaotong City, Yunnan Province in the north, and across the Jinsha River from Huili County and Huidong County, Liangshan Prefecture, Sichuan Province, with a total area of 1858.79 square kilometers. Dongchuan District is located on the northern edge of the Yunnan-Guizhou Plateau, with the highest elevation of 4344.1 meters, the lowest elevation of 695 meters, and the height difference of 3649.1 meters. Dongchuan District is rich in mineral resources and is one of the six major copper production bases in China. Jiaozi Snow Mountain is known as "the first mountain in central Yunnan". The Xiaojiang basin is a typical rainstorm and debris flow area in the world, which is called "the natural museum of debris flow". Both sides of the Xiaojiang River are Kunming.
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