• Columbus
  • Ludian County

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.

Ludian County is one of the counties under the jurisdiction of Zhaotong City, Yunnan Province, located in the northeast of Yunnan Province, the south of Zhaotong City, the north bank of Niulan River. The east-west horizontal distance of the county is 50 kilometers, the north-south vertical distance is 60 kilometers, and the total area is 1519 square kilometers, of which the mountain area accounts for 87.9 percent of the total area and the dam area accounts for 12.1 percent. As of 2013, Ludian County has jurisdiction over 10 towns, 2 townships (including 2 ethnic townships), a total of 4 neighborhood committees and 80 administrative villages. The county government is in Wenping town. The vertical climate change in Ludian County is obvious, with no extreme heat in summer and no severe cold in winter. The average annual temperature is 12.1 ℃, the annual frost-free period is 220 days, and the average annual precipitation is 900mm. There are silver, lead, copper, sulfur, coal, phosphorus and other mineral deposits, Lemachang silver mine in the territory. Ludian County is the main producing county of wax insects in China, and the main producing county of walnut and high quality flue-cured tobacco in Yunnan Province.
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