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.
Dulan County is located in the southeast of Haixi Mongolian-Tibetan Autonomous Prefecture of Qinghai Province. Dulan (which means "warm" in Mongolian) has a total area of 45270 square kilometers. As of 2013, the total population was nearly 100000. Mainly Han nationality, as well as Tibetan, Mongolian, Hui, Turkish and other ethnic minorities. The county people's government is stationed in Cn Wusu Town, 205 kilometers away from Delingha, the state capital, and 428 kilometers from Xining, the provincial capital. Dulan County is located in the southeast corner of Qaidam Basin. The whole territory can be divided into two geomorphological types: Khan Buda Mountain area and Qaidam Basin Plain. Gobi, desert, valley, rivers and lakes, hills, plateaus, mountains and other topography are distributed in turn. There are more than 40 rivers, such as Shaliu River, Tuoso River, Cn Wusu River and so on. It belongs to the arid continental climate of the plateau, with an average annual temperature of 2.7 ℃ and a minimum extreme temperature of-29.8.