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.
Tieshan District, located in the west of Huangshi City, Hubei Province, is rich in mineral resources and is named for its rich iron ore. More than 1700 years ago, the ancestors dug and smelted here. Dongfangshuo studied here in the Han Dynasty; Yue Fei, a national hero, forged the "sword of Daye" here; at the end of the Qing Dynasty, Zhang Zhidong, governor of Huguang, built China's first large-scale open-pit iron ore, Daye Iron Mine, which was the largest in East Asia at that time. Tieshan became the cradle of China's modern iron and steel industry. Tieshan District Railway connects Beijing-Guangzhou and Beijing-Kowloon two major transport arteries, and National Highway 106 runs through the whole territory. Tourist attractions include Yellowstone National Mining Park, Luzhangshan Park, Tieshan Temple, Huazang Temple and so on. During the 12th five-year Plan period, Tieshan will invest 20 billion yuan to build the "Iron City of the World".