• Columbus
  • Tumen

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.

Tumen City is located in the east of Jilin Province, the eastern foot of Changbai Mountains and the lower reaches of the Tumen River, facing Wancheng County in North Korea, Hunchun City in the east, Yanji City in the west, Longjing City in the south and Wangqing County in the north. As of 2007, Tumen City has jurisdiction over 3 streets and 4 towns, with a total area of 1142.65 square kilometers. By the end of 2011, the total population of Tumen City was 126606. It is a multi-ethnic city dominated by the Korean nationality. The three lines of road, railway and shipping in Tumen City are all located in the "Golden Triangle" of Northeast Asia, which is an international transportation hub connecting the hinterland of Northeast China, North Korea and the Russian far East. On December 29, 2018, the sixth national unity and progress demonstration zone was named by the State ethnic Affairs Commission.
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