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.
Tongxu, known as Xianping in ancient times, has a long history and culture, and now belongs to Kaifeng, the ancient capital of the seven dynasties. Tongxu County is located in the middle and east of Henan Province, the middle and lower reaches of the Yellow River, belonging to the eastern plain of Henan Province. The topography is high in the west and low in the east, high in the north and low in the south, tilting from northwest to southeast. It faces the Yellow River to the north, Songshan Shaolin to the west, Shangqiu, the important town in the east of Henan Province to the east, Zhoukou, a famous historical city to the south, 80 kilometers to the northwest from the provincial capital Zhengzhou, and 40 kilometers to the north to Kaifeng, the ancient capital. Located in the core area of the construction of the national strategic Central Plains Economic Zone, it is the route of Hengxiang railway in the planning. Tongxu County has jurisdiction over six towns and six townships, with a width of 30.5km from east to west and 34.8km from north to south, with a total area of 766.22 square kilometers. It is a part of the Huang-Huai Plain formed by the impact to the south of the Yellow River. The soil area of the county is 963742 mu.