Wichita (/ˈwɪtʃɪtɔː/ WITCH-ih-taw) is the largest city in the U.S. state of Kansas and the county seat of Sedgwick County. As of the 2020 census, the population of the city was 397,532. The Wichita metro area had a population of 647,610 in 2020. It is located in south-central Kansas on the Arkansas River.
Wichita began as a trading post on the Chisholm Trail in the 1860s and was incorporated as a city in 1870. It became a destination for cattle drives traveling north from Texas to Kansas railroads, earning it the nickname "Cowtown". Wyatt Earp served as a police officer in Wichita for around one year before going to Dodge City.
Lanzhou, referred to as "Lanzhou" or "Gao", or Jincheng in ancient times, is the capital of Gansu Province, an important industrial base and comprehensive transportation hub in northwest China approved by the State Council, one of the important central cities in the western region, and an important node city of the Silk Road Economic Belt. By 2018, the city had jurisdiction over five districts and three counties, with a total area of 13100 square kilometers, a built-up area of 321.75 square kilometers, a resident population of 3.7536 million, an urban population of 3.0415 million, and a urbanization rate of 81.03%. Lanzhou is located in northwest China and the central part of Gansu Province. It is located in the geometric center of the land territory of the Chinese mainland. It is a comprehensive transportation hub of railways, highways and aviation in Northwest China. It is also the headquarters of the army organs in the western theater of the Chinese people's Liberation Army. It is also the new Eurasian continental bridge.