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.
Baiyu County, which belongs to Ganzi Tibetan Autonomous Prefecture of Sichuan Province, is located in the transitional zone from Qinghai-Tibet Plateau to Yunnan-Guizhou Plateau. It belongs to the northern section of the Hengduan Mountains and the east bank of the upper reaches of the Jinsha River. It is located between 98 degrees 36 minutes east longitude to 99 degrees 56 minutes and 30 degrees 22 minutes to 31 degrees 40 minutes north latitude. It is bordered by Xinlong County to the east, Batang and Litang counties to the south, Gongjue and Jiangda counties in Tibet to the west, and Ganzi County and Dege County to the north. By the end of 2011, Baiyu County had an area of 10591 square kilometers and had jurisdiction over 1 town and 16 townships with a total population of 53600, a birth rate of 8.64 ‰ and a natural population growth rate of 6.67 ‰. In 2011, Baiyu County achieved a GDP of 869 million yuan, an increase of 9.7% over 2010.