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.
Wudu District, under the jurisdiction of Longnan City, Gansu Province, is located in the southeast of Gansu Province, the central part of Longnan City and the middle reaches of the Bailong River. Wudu began as a place name in the pre-Qin Dynasty, Wudu County in the Western Han Dynasty, Jiizhou in the Tang Dynasty, Wudu County in the Republic of China, and the county was withdrawn in 2004. Wudu District is the political, economic, cultural, transportation center and military center of Longnan, and one of the regional central cities in the southeast of Longnan. It has jurisdiction over 4 subdistrict offices, 26 towns, 8 townships, 2 ethnic townships, 50 communities and 649 villages, covering an area of 4683 square kilometers; the total population is 602829, the resident population is 568100, and the urbanization rate is 40.56% (2017). Wudu District is located in the junction of Qin and Ba Mountains, known as "Ba Shu throat, Qin long lock key". It is the friend of Gansu, Shaanxi and Sichuan provinces.