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.
Kaiyuan City, located in the southeast of Yunnan Province, belongs to Honghe Hani and Yi Autonomous Prefecture. Yanshan in the east, Qiu Bei in the south, Mengzi and Gejiu in the south, Jianshui in the west and Maitreya in the north are the traffic fortresses and central cities in southeastern Yunnan. The total area is 1946.91 square kilometers and the population is 334100 (2016). Kaiyuan is rich in coal resources. Xiaolongtan, 20 kilometers away from the city, has lignite reserves of 1.2 billion tons, which is the largest open-pit coal mine in Yunnan, with an annual mining capacity of 6.3 million tons. There is a 600000 kilowatt Kengkou power plant. Cement, chemical fertilizer, sugar, papermaking, wine, food and other industries are beginning to take shape. In 2011, Kaiyuan realized 4.03 billion yuan in industrial added value and 1.19 billion yuan in profits and taxes. In March 2015, Kaiyuan was officially named by the National Association of Love and Health.