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.
Dulan County is located in the southeast of Haixi Mongolian-Tibetan Autonomous Prefecture of Qinghai Province. Dulan (which means "warm" in Mongolian) has a total area of 45270 square kilometers. As of 2013, the total population was nearly 100000. Mainly Han nationality, as well as Tibetan, Mongolian, Hui, Turkish and other ethnic minorities. The county people's government is stationed in Cn Wusu Town, 205 kilometers away from Delingha, the state capital, and 428 kilometers from Xining, the provincial capital. Dulan County is located in the southeast corner of Qaidam Basin. The whole territory can be divided into two geomorphological types: Khan Buda Mountain area and Qaidam Basin Plain. Gobi, desert, valley, rivers and lakes, hills, plateaus, mountains and other topography are distributed in turn. There are more than 40 rivers, such as Shaliu River, Tuoso River, Cn Wusu River and so on. It belongs to the arid continental climate of the plateau, with an average annual temperature of 2.7 ℃ and a minimum extreme temperature of-29.8.