• Oklahoma City
  • Tumen

Oklahoma City (/oʊkləˌhoʊmə -/ (listen)), officially the City of Oklahoma City, and often shortened to OKC, is the capital and largest city of the U.S. state of Oklahoma. The county seat of Oklahoma County, it ranks 20th among United States cities in population, and is the 8th largest city in the Southern United States. The population grew following the 2010 census and reached 687,725 in the 2020 census. The Oklahoma City metropolitan area had a population of 1,396,445, and the Oklahoma City–Shawnee Combined Statistical Area had a population of 1,469,124, making it Oklahoma's largest municipality and metropolitan area by population.

Oklahoma City's city limits extend somewhat into Canadian, Cleveland, and Pottawatomie counties, though much of those areas outside the core Oklahoma County area are suburban tracts or protected rural zones (watershed). The city is the eighth-largest in the United States by area including consolidated city-counties; it is the second-largest, after Houston, not including consolidated cities. The city is also the second largest by area among state capital cities in the United States, after Juneau, Alaska.

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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