• Oklahoma City
  • Heilongjiang

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.

Heilongjiang Province, referred to as "black", the provincial capital Harbin, is the northernmost and easternmost provincial administrative region in China, with a total area of 473000 square kilometers. The geomorphological feature of Heilongjiang Province is "five mountains, one water and one grass". The terrain is generally high in the northwest, north and southeast, and low in the northeast and southwest, which is composed of mountains, platforms, plains and water surfaces; the land spans the four major river systems of Heilongjiang, Wusuli River, Songhua River and Suifenhe, belonging to cold temperate and temperate continental monsoon climate. Heilongjiang Province, located in the hinterland of Northeast Asia, is an important passage from Asia and the Pacific to Russia and the European continent, and an important window for China to open along the border. As of August 2019, Heilongjiang Province had jurisdiction over 12 prefecture-level cities and 1 district; there were 54 municipal districts, 21 county-level cities, 45 counties,
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