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.
Chang'an District, Xi'an City, Shaanxi Province is located in the hinterland of Guanzhong Plain, south by Qinling Mountains, surrounded by Xi'an from the west and south, with mountains, rivers and plateaus, with a total area of 1580 square kilometers and 25 subdistrict offices. The resident population of the region is 1.130213 million (2019) and the registered permanent population is 1.083 million (2016). Changan District has a superior location and convenient transportation, and the Weiqu residence of the district government is only 8.7 kilometers away from the clock tower in the core of Xi'an. Ancient Chang'an was once the capital of 13 dynasties, including Zhou, Qin, Han and Tang dynasties. There are ten sites including the Fenghao site of the Zhou Dynasty, the Afang Palace of the Qin Dynasty, and eight famous mountains, including Cuihua Mountain, Wutai Mountain, Xiangyu Mountain and Qinghua Mountain. There are 42 monasteries, including Xingjiao Temple, Huayan Temple, Xiangji Temple, and the ten major sects of Buddhism, including Fa Xiangzong, Pure Land sect and Huayan Temple.