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.
Dangtu County, which belongs to Maanshan City, Anhui Province, is located in the east of Anhui Province and the east bank of the lower reaches of the Yangtze River. It is bordered by Bowang District and Shijiu Lake to the east, Lishui District and Gaochun District in Nanjing City, Jiangsu Province to the east, the Yangtze River to the west, across the river to Hexian County, Wuhu County and Xuancheng City to the south, and Yushan District to the north. Dangtu County has a history of more than 2200 years. Danyang County was established in the Qin Dynasty, and it was named Dangtu in the ninth year of Sui Kaihuang (589). In history, the county seat was the seat of Taiping Prefecture in Song Dynasty, Taiping Mansion in Ming and Qing dynasties, Yangtze River navigator in Qing Dynasty and Anhui Science and Government Office. Since the Qin Dynasty, it has attracted more than 600 poets to leave more than 1000 popular poems here. Xie Kui, a great poet of the Southern Dynasty, called it "the capital of mountains and rivers". The poem fairy Li Bai visited Dangtu seven times and wrote 56 unique poems such as "Wangtianmen Mountain".