• Oklahoma City
  • Ya'an

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.

Ya'an, a prefecture-level city of Sichuan Province, is located at the western edge of Sichuan Basin and the eastern foot of Qionglai Mountain, with Chengdu, Ganzi to the east, Liangshan to the south and Aba to the north, 120km away from Chengdu; it belongs to the mountainous area on the western edge of Sichuan Basin, spanning the Sichuan Basin and the Qinghai-Tibet Plateau; the climate type is subtropical monsoon humid climate; the total area of the city is 15046 square kilometers, under the jurisdiction of 2 districts and 6 counties; the total population in 2017 is 1.5378 million. Ya'an is located at the intersection of Sichuan-Tibet and Sichuan-Yunnan Highway, 120 kilometers away from Chengdu. It is the transition zone between Sichuan Basin and Qinghai-Tibet Plateau, the transition zone between Han culture and national culture, and the transition zone between modern central city and primitive natural ecological area. it was the gateway and necessary road of the ancient southern Silk Road and was once the capital of Xikang Province. It is the history and culture of Sichuan Province.
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