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.
Suining, a prefecture-level city of Sichuan Province, also known as Doucheng and Suizhou, is located in the middle of Sichuan Basin. It is the regional central city of Chengdu-Chongqing Economic Zone, the modern industrial base of Sichuan Province, and the modern ecological garden city characterized by "heart-nourishing" culture. Chengdu is connected to the west, Chongqing, Guang'an and Nanchong to the east, Neijiang and Ziyang to the south, Deyang and Mianyang to the north, and an isometric triangle to Chengdu and Chongqing. Located in the main axis of the development of urbanization in Sichuan, it is one of the "six metropolitan areas" strategically deployed in Sichuan Province, and an important part of Chengdu economic circle and Chengdu plain urban agglomeration. Suining has a total area of 5300 square kilometers and has jurisdiction over 1 county-level city, 2 municipal districts and 2 counties. In 2018, the registered population is 3.6535 million and the city's GDP is 122.139 billion yuan. Located in the low hills of the central Sichuan Basin.