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.
Dingbian County is located in the northwest of Shaanxi Province, the westernmost end of Yulin City, and the junction of seven counties (banners) of four provinces (regions) of Shaanxi, Gansu, Ningxia and Inner Mongolia. In ancient times, it is said that "Yuyan is connected to the east, Ganliang to the west, Huanqing to the south, pillow desert to the north, Tu Guang Bian long, and Sanqin fortress". It is the northwest gate of Shaanxi Province and the west gate of Yulin City. Since ancient times, merchants have gathered, known as "dry wharf". The county has jurisdiction over 1 subdistrict office, 14 towns and 4 townships. Mineral resources such as oil, natural gas, raw salt, mirabilite, magnesium sulfate and magnesium chloride have many advantages, which are an important part of the energy and heavy chemical industry base in northern Shaanxi. The domestic oil resources are widely distributed, with proven reserves of 1.618 billion tons, making it the largest county in oil production capacity in the country. Dingbian County is also the salt producing area of Shaanxi Province, with 14 salt lakes and a total area of 98 square kilometers. In addition, the whole county