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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.

Dandong, a prefecture-level city in Liaoning Province, is located in the southeast of Liaoning Province, facing Xinyi City of the Democratic people's Republic of Korea in the east, the Yellow Sea in the south, Anshan in the west, Dalian in the southwest and Benxi in the north. The geographical coordinates are 123 °22'E to 125 °42'E and 39 °43'N to 41 °09'N. The maximum horizontal distance from east to west is 196km, the maximum vertical distance from north to south is 160km, the coastline is 126km long, with a total area of 15222 square kilometers and a population of 2.34 million. It has jurisdiction over 3 municipal districts, 1 autonomous county and 2 county-level cities. Dandong is the starting point of the northern end of China's coastline and is located in the heart of Northeast Asia. it is an important intersection of the Northeast Asian economic circle and the economic circle around the Bohai Sea and the Yellow Sea.
Airport In Dandong - Dandong Langtou Airport
Dandong Langtou Airport (Dandong Langtou Airport, IATA: DDG, ICAO: ZYDD), located on the east side of National Highway 201, Langtou Town, Zhenxing District, Dandong City, Liaoning Province, China, 6 kilometers east of Dandong city center, is a 4C-level military-civilian joint feeder airport   .
On December 21, 1985, Dandong Langtou Airport officially opened civil aviation services, and Donggou Qianyang Airport civil aviation was closed; on April 9, 2007, the air port of Dandong Langtou Airport was temporarily opened to the public; on April 17, 2014, Dandong Langtou Airport Singapore Airlines Station opening   .
According to the official website of Liaoning Provincial Airport Management Group Co., Ltd. in April 2020, the terminal area of ​​Dandong Langtou Airport is 20,780 square meters, with 2 boarding bridges; the civil aviation station area is 39,600 square meters, with 6 C-class aircraft seats ;The runway is 2,600 meters long and 45 meters wide; it can meet the needs of annual passenger throughput of 2 million passengers and cargo and mail throughput of 4,200 tons   .
In 2019, Dandong Langtou Airport completed a total of 259,048 passenger throughput, a year-on-year increase of 211.2%, ranking 179th in the country; cargo and mail throughput was 652.1 tons, a year-on-year increase of 50.9%, ranking 141st in the country; 2053 aircraft movements, Year-on-year growth of 187.1%, ranking 209th in the country   .
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