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.
Zhouqu County, which belongs to Gannan Tibetan Autonomous Prefecture in Gansu Province, is located in the south of Gansu Province and in the southeast of Gannan Tibetan Autonomous Prefecture. Zhouqu means "Longjiang" in Tibetan and gets its name from the Bailong River passing through the county. Zhouqu system began in the pre-Qin period. In the 28th year of Qin Zhaowang (279 BC), Qiangdao County was located in the northwest of Zhouqu, Xigu County was set up after liberation, Zhouqu County was renamed Longdi County in 1959, and Zhouqu County was restored in 1962. By 2016, Zhouqu County had jurisdiction over 4 towns, 15 townships, 208 administrative villages and 403 natural villages, with a total population of 142000, of which 50400 were Tibetans, accounting for 35.8%. Zhouqu County is located in the Min, Dieshan system of the West Qinling Mountains and the edge of the Qinghai-Tibet Plateau, which is a typical alpine canyon landform. "one river and two rivers (Bailong River and Gongba River)