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.
Gansu, referred to as "Gan" or "long", is the provincial administrative region of the people's Republic of China and the capital of Lanzhou. It is located in northwest China, connecting Shaanxi to the east, Xinjiang to the west, Sichuan and Qinghai to the south, Ningxia and Inner Mongolia to the north, and Mongolia to the northwest. It is between 32 °11 miles north latitude 42 °57 miles north and 92 degrees 13 miles east longitude, covering a total area of 425800 square kilometers. The topography of Gansu is long and narrow, with complex and diverse landforms, including mountains, plateaus, flat rivers, river valleys, deserts and Gobi, surrounded by mountains and mountains, and the terrain inclines from southwest to northeast. Gansu is located in the confluence of the Loess Plateau, the Qinghai-Tibet Plateau and the Inner Mongolia Plateau. The climate types from south to north include subtropical monsoon climate, temperate monsoon climate, temperate continental arid climate and plateau.