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.
Dunhua City, which belongs to Yanbian Korean Autonomous Prefecture, is the "west gate" of Yanbian Prefecture. Located in the eastern mountainous area of Jilin Province, the hinterland of Changbai Mountain, one of the node cities in the pilot area of Changjitu development and opening up, it is the largest county-level city in Jilin Province and an important transportation hub in Jilin Province. it connects Jilin and Heilongjiang provinces, four districts and nine counties and cities. Dunhua is known as the "century-old county, the ancient capital of thousands of years". It is the capital of the Bohai Sea in the Tang Dynasty, Aodong City in the Ming and Qing dynasties, and the birthplace of the Manchu royal family. In 1881, a county was established and named Dunhua; in 1958, the county under the jurisdiction of the province was assigned to Yanbian Korean Autonomous Prefecture, and the county was withdrawn to set up a city in 1985. Dunhua is an excellent tourist city, a national sanitary city, a national garden city, a national model city with double support, a model collective of national unity and progress, and the name of Chinese solid wood products.