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.
Siyang is located in Subei Plain, one of the "Ten New Tianfu" in China, belongs to the Yangtze River Delta region, is the Huaihai Economic Circle, the Yangtze River Delta Economic Circle and the cross radiation area along the canal town axis. Siyang faces the hometown of Zhou Enlai Huai'an to the east, Suqian the hometown of King Xiang to the west, Shuyang, the hometown of flowers and plants to the north, and Hongze Lake to the south, facing Sihong, Hongze and Xuyi across the lake. The Siyang section of the Grand Canal of China (the Beijing-Hangzhou Grand Canal and the ancient Yellow River heritage site) is on the World Heritage list. It has the reputation of "plain, forest and sea, Xanadu". Siyang has a history of more than 5000 years of civilization and more than 2000 years of history of establishing a county, where the north and south cultures are integrated. Siyang was once the capital of Sishui in the Western Han Dynasty more than two thousand years ago. It has been established at the county level in 2233 years, and it was crowned twice in the Western Han Dynasty, which was called "Surabaya" in history, which lasted for 134 years. Siyang is China.