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.
Jiuquan, a prefecture-level city of Gansu Province, is located between Altun Mountain, Qilian Mountain and Mazong Mountain at the western end of Hexi Corridor in the northwest of Gansu Province, between latitude 38 °09 "42 °48" north and longitude 92 °20 "100 °20'E. it has been the traffic fortress of the Central Plains and the northeast leading to Xinjiang and the western region since ancient times. In the north, except for a small part of Mongolia, most of it is connected with Alashan League in Inner Mongolia and Xinjiang Uygur Autonomous region to the west. The southern boundary of Qinghai Haixi Mongolian Autonomous Prefecture and Haibei Tibetan Autonomous Prefecture is adjacent to Zhangye City in the east, with a total area of 192000 square kilometers, accounting for 42% of the area of Gansu Province. Jiuquan is one of the four counties in Hexi in the Han Dynasty and an important town of the Silk Road. The terrain is high in the south and low in the north, tilting from southwest to northeast, Qilian main peak from east to west, Gaolai Mountain,