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.
Tianshui, a prefecture-level city under the jurisdiction of Gansu Province, is located in the southeast of Gansu Province, adjacent to Guanzhong Plain. It is an important node city of Guanzhong Plain Urban agglomeration and the sub-core city of Guanzhong-Tianshui Economic Zone. Tianshui, once known as Shangli, Chengji and Qinzhou, is said to be the birthplace of Fuxi and Nu WA, one of the important birthplaces of Chinese civilization, known as "the hometown of Emperor Xi". Tianshui has jurisdiction over 2 districts and 5 counties, with a total area of 14325 square kilometers and a total population of 3.829 million, including 3.3549 million permanent residents (2018). Tianshui is high in the northwest and low in the southeast, with an elevation of 1000-2100 meters above sea level. The climate is temperate monsoon climate. Tianshui is a famous historical and cultural city in China, an excellent tourist city in China, and one of China's old industrial bases. It has national and provincial enterprise technology centers and engineering.