Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since 2010. Colorado Springs is the second-most populous city and the most extensive city in the state of Colorado, and the 40th-most populous city in the United States. It is the principal city of the Colorado Springs metropolitan area and the second-most prominent city of the Front Range Urban Corridor. It is located in east-central Colorado, on Fountain Creek, 70 miles (113 km) south of Denver.
Ansai District, which belongs to Yan'an City, Shaanxi Province, is located in the hinterland of the inland Loess Plateau, the edge of Ordos Basin, in the north of Shaanxi Province, due north of Yan'an City, west of Zhidan County, Jingbian County of Yulin City in the north, Zichang County in the east, and Ganquan County and Baota District in the south. Between longitude 108 °5 "44"-109 °26 "18" east and latitude 36 °30 °45 "- 37 °19" 3 "north. The distance between the north and south lines is 92 kilometers, and the east-west distance is 36 kilometers, with a total area of 2950 square kilometers, accounting for 8.04 percent of the total area of Yan'an. Ansai has been known as the "upper county throat" since ancient times. It is located in the cultural fusion zone in which the national culture of the Central Plains represented by Yangshao culture develops northward and the northern national culture represented by Yinshan rock painting culture develops to the south.