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.
Langfang, a prefecture-level city of Hebei Province, is located in the east-central part of Hebei Province, facing the capital Beijing in the north, bordering Tianjin in the east, Cangzhou in the south and Baoding in the west. Most of Langfang is located in the depression area due to the influence of geological structure; it is located in the middle latitudes and belongs to the warm temperate continental monsoon climate; it is located in the core of Beijing-Tianjin-Hebei urban agglomeration, around the hinterland of Bohai Sea. Langfang has jurisdiction over two districts, two county-level cities and six counties, with a total area of 6429 square kilometers and an urban area of 54 square kilometers. The registered population is 4.795 million in 2018. Langfang City is located in the central and eastern part of the North China Plain and the central part of Hebei Province. Langfang territory starts from the hilly area at the southern foot of Yanshan in the north and reaches the Heilonggang basin in the south. Langfang City is located in the middle latitudes, is a warm temperate continental monsoon climate, four distinct seasons. Langfang City is located in the middle and lower reaches of the Haihe River Basin.