Phoenix (/ˈfiːnɪks/ FEE-niks; Navajo: Hoozdo; Spanish: Fénix or Fínix,[citation needed] Walapai: Banyà:nyuwá) is the capital and most populous city of the U.S. state
of Arizona, with 1,608,139 residents as of 2020. It is the fifth-most populous city in the United States, and the only U.S. state capital with a population of more than one million residents.
Phoenix is the anchor of the Phoenix metropolitan area, also known as the Valley of the Sun, which in turn is part of the Salt River Valley. The metropolitan area is the 11th largest by population in the United States, with approximately 4.85 million people as of 2020. Phoenix, the seat of Maricopa County, has the largest area of all cities in Arizona, with an area of 517.9 square miles (1,341 km2), and is also the 11th largest city by area in the United States. It is the largest metropolitan area, both by population and size, of the Arizona Sun Corridor megaregion.
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".