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.
Hengyang County, which belongs to Hengyang City, Hunan Province, is located in the northwest of Hengyang City, the middle reaches of Xiangjiang River, named because it is located in the south of Nanyue Hengshan Mountain, bordering Nanyue District and Hengshan County in the east, steaming Xiang District, Shigu District and Hengnan County in the south, Qidong County in the west, Shaodong County in Shaoyang City, and Shuangfeng County in Loudi City in the north. It is 74 kilometers wide from east to west and 55 kilometers from north to south, with a total area of 2558 square kilometers, about 10 kilometers away from Hengyang city. Beijing-Guangzhou Railway, Huai Shaoheng Railway and an-Zhangheng Railway pass through the border. Hengyang County is rich in products, known as "land of fish and rice", famous for non-ferrous metals, known as "hometown of non-ferrous metals" and "hometown of non-metals". Hengyang County is not only an important commercial grain production base in southern China, but also an important producing area of livestock, pigs and other agricultural by-products. In 2018, there were 17 Hengyang counties under its jurisdiction.