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.
Huainan, a prefecture-level city under the jurisdiction of Anhui Province, referred to as "Huai" and the ancient name "Zhoulai", is located in the central and northern part of Anhui Province, in the hinterland of the Yangtze River Delta and on the bank of the Huaihe River. it is known as "Zhongzhou throat, Jiangnan barrier" and "colorful Huainan". It is an important node of the urban agglomeration along the Huaihe River and the core city of Hefei metropolitan area. Huainan has a total area of 5571 square kilometers and has jurisdiction over 5 districts and 2 counties. By the end of 2016, the total population was 3.456 million. Huainan is the energy capital of China, the industrial granary of East China, the important industrial city of Anhui Province and one of the 13 larger cities of the State Council. It has obtained China's excellent tourist cities, 100 livable cities, national greening model cities, national garden cities, the first batch of national pilot smart cities, the best investment cities in China, the happiest cities in China, and Chinese idioms.