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.
Huainan, a prefecture-level city under the jurisdiction of Anhui Province, referred to as "Huai" and the ancient name "Zhoulai", is located in the central and northern part of Anhui Province, in the hinterland of the Yangtze River Delta and on the bank of the Huaihe River. it is known as "Zhongzhou throat, Jiangnan barrier" and "colorful Huainan". It is an important node of the urban agglomeration along the Huaihe River and the core city of Hefei metropolitan area. Huainan has a total area of 5571 square kilometers and has jurisdiction over 5 districts and 2 counties. By the end of 2016, the total population was 3.456 million. Huainan is the energy capital of China, the industrial granary of East China, the important industrial city of Anhui Province and one of the 13 larger cities of the State Council. It has obtained China's excellent tourist cities, 100 livable cities, national greening model cities, national garden cities, the first batch of national pilot smart cities, the best investment cities in China, the happiest cities in China, and Chinese idioms.