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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.

Chenggu County, belonging to Hanzhong City, Shaanxi Province, is located in the hinterland of Hanzhong Basin in southern Shaanxi, with the southern foot of Qinling Mountains to the north, the northern slope of Nanpingba Mountain to the north, and the Hanjiang River in Zhongna to the north. Between longitude 107 °30 'east longitude and 32 °45km north latitude, the terrain is north-south long (average length 101km), east-west narrow (average length 42km), with a total area of 2265 square kilometers. Chenggu, which has been established under the county system in the Qin Dynasty for more than 2300 years, is a "famous historical and cultural city" in Shaanxi Province. It is the life and burial place of Li Gu, a famous diplomat, explorer and pioneer of the Silk Road in the Western Han Dynasty, who is known as quot;, the mouthpiece of quot; Beidou. There are 437 scenic spots, cultural landscapes and cultural sites in the territory, including Tibetan.
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