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.
Longxian, which belongs to Baoji City, Shaanxi Province, is called Longzhou in ancient times, because it is located in Dongzaka, Longshan. It is located in the west of Guanzhong Plain and northwest of Baoji City. It faces Qianyang to the east, Chencang District to the south and Qingshui, Zhangjiachuan, Huating, Chongxin and Lingtai five counties in the northwest. It is between longitude 106o 26mm 32 "- 107o 811" east and latitude 34o 35m 17 "- 35o 6m 45" N, with a width of 57.6km from north to south and 59.7km from east to west, with a total area of 2285 square kilometers. Longxian is called Longzhou in ancient times, because it is located on the east slope of Longshan. Qin Xianggong established the capital, and Longguan was established in the Han Dynasty, which is known as "the capital of Qin and Han pass". It is the first male pass on the ancient Silk Road to the west of Chang'an. Longxian County has a good ecology, with 60% forest coverage and 49 large and small rivers, which is known as the "faucet of Guanzhong".