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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.

Chengguan District, which belongs to Lanzhou City, Gansu Province, is located in the central and eastern part of Gansu Province, between longitude 103 °46km east and latitude 35 °58km. It is 20.02 km long from east to west, 22.6 km wide from north to south and covers an area of 220 square km. Chengguan District is the central area of Lanzhou, the capital of Gansu Province, where the party, government and military organs are stationed, and the political, economic, scientific, technological and cultural center of the province. The geomorphology is characterized by the crossing of the Yellow River between the north and south mountains. The Yellow River enters the Yellow River Estuary from the Leitan River, and Gaolan Mountain and Baita Mountain face each other from the north to the south. Chengguan District is a mid-temperate semi-arid zone, the average elevation in the urban area is 1520 meters, the highest peak is Yingpanling in the southeast of Gaolan Mountain, 2171 meters above sea level, and the lowest is the north beach of Yantan, 1503 meters above sea level. The annual average temperature is 1.
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