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.
Yiyuan County, which belongs to Zibo City, Shandong Province, is located in the middle of Shandong Province, Linqu County of Weifang City to the east, Yishui County to the southeast, Laiwu District and Gangcheng District of Jinan City to the west, Xintai City of Taian City to the southwest, Mengyin County of Linyi City to the south, and Boshan District and Zichuan District to the north. In 1944, it established a county with a total area of 1636 square kilometers, with 10 towns, 2 streets, 1 provincial economic development zone and 643 villages (communities) under its jurisdiction by 2017. As of December 31, 2017, the total population of Yiyuan County is 569900. Yiyuan is the roof of Shandong Province, China, with an average elevation of 401 meters, which is the highest in Shandong Province. There are 1983 famous hills in the territory, and the highest elevation of Mount Lushan is 1108 meters, which is the fourth peak in Shandong Province. There are 1530 large and small rivers.