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.
Longxi County is located in the southeast of Gansu Province, in the middle of Dingxi City, in the upper reaches of Weihe River, in the middle of Longzhong Loess Plateau. It is connected with Tongwei County in the east, Wushan and Zhangxian in the south, Weiyuan County in the west and Anding District in the north. It belongs to Dingxi City, Gansu Province. Longxi gets its name because it is to the west of Longshan. Since ancient times, it has been the "country of the four Serbs", a place that must be fought for by military families. As far back as the prehistoric period, the ancestors thrived on this land, leaving cultural sites such as Yangshao and Qijia. King Zhao of Qin Dynasty established Longxi County in the 35th year (272 BC) and Xiangwu County in the early Han Dynasty. The Sui Dynasty changed to Longxi County, and the name of the county is still in use today. As of 2016, Longxi County covers an area of 2408 square kilometers and has jurisdiction over 10 towns, 7 townships, 215 administrative villages, 11 communities, 1287 village groups, with a total population of 519200.