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.
Weng'an is located in the southwest hinterland, is a national health county and China's ecological charm county, the national phosphorus chemical ecological production base, known as the "Asian phosphorus warehouse" reputation. Weng'an is an old revolutionary base. The Red Army passed Weng'an four times on the long March and held a historic monkey farm meeting in Weng'an, which Comrade Zhou Enlai called "the eve of a great turning point." Weng'an is the place of origin of life and the ancient city with thousands of years of civilization. Fossils of faunas from 610 million years ago have been found here, and they are the earliest fossils found so far. On December 25, 2017, the General Office of Guizhou Provincial Government issued the implementation Plan for Guizhou Province to accelerate the Construction of a New Type of urbanization with Mountain characteristics, which shows that the Guizhou Provincial Government supports Weng'an County to remove counties and cities.