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.
Dunhuang, hosted by Jiuquan City, Gansu Province, is located at the westernmost end of the Hexi Corridor and at the confluence of Gansu, Qinghai and Xinjiang provinces (regions). It is located between 92 °13 degrees east longitude and 95 °30 degrees east longitude, 39 °40 degrees north latitude and 41 °40 degrees north latitude, with a total area of 31200 square kilometers. Dunhuang is a node city of the Silk Road, famous for its "Dunhuang Grottoes" and "Dunhuang murals". It is the site of the World Heritage Mogao Grottoes and Yumengguan and Yangguan on the border of the Han Great Wall. In 2012, it was selected as one of the "Top 200 cities with Chinese characteristics" and is a famous historical and cultural city in China. In 2018, Dunhuang had nine towns, one farm and one base under its jurisdiction, with a total resident population of 191100 and a GDP of 98.78.