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.
Qilian County, which belongs to Haibei Tibetan Autonomous Prefecture of Qinghai Province, gets its name because it is located in the hinterland of the middle part of Qilian Mountains. It is adjacent to the Gansu Hexi Corridor, the primary passage of the ancient Silk Road, to the north, so it is known as the "north gate" of Qinghai. Qilian County covers an area of 14000 square kilometers, accounting for 41% of the total land area of the whole state. It has jurisdiction over 45 administrative villages in 4 townships and 3 towns, with a total population of 50,000 as of 2013, with 15 ethnic groups, including Han, Tibetan, Mongolian and Hui, with ethnic minorities accounting for 79.2% of the population. The average elevation in the territory is 3169 meters, the county seat is 2787 meters above sea level, the annual average temperature is 1 ℃, and the annual precipitation is about 420mm, which is a typical plateau continental climate. Qilian is an important resource-rich area in Qinghai Province. A variety of mineral resources, known as "China's Ural", is a key county in the development of resources in the province. "Qilian" system