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.
Hunchun City, which belongs to Yanbian Korean Autonomous Prefecture of Jilin Province, is located in the east of Jilin Province and southeast of Yanbian Korean Autonomous Prefecture. Hunchun is bordered by Hunchun Ridge and Hassan District of Russia's coastal border region. The total length of the border is 246km. The southwest is bounded by the Tumen River and is adjacent to Hamgyong North Road of North Korea. The total length of the border is 139.5 km. The north is bounded by Laoyeling and adjoins Wangqing County, the northwest corner is connected with Tumen City, and the northeast is adjacent to Dongning City, Heilongjiang Province. It is between longitude 130o 03m 21 "- 130o 18m 33" east and latitude 42o 25m 20 "- 43o 30m 18" north, with a total area of 5145 square km. Hunchun is the only border city in China located at the junction of China, North Korea and Russia, because it is at the core of international cooperation and development in the Tumen River region.