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.
Shaanxi, referred to as "Shaanxi" or "Qin", the provincial administrative region of the people's Republic of China, the provincial capital Xi'an, is located in the hinterland of China, the middle reaches of the Yellow River, Shanxi and Henan to the east, Ningxia and Gansu to the west, Sichuan, Chongqing and Hubei to the south and Inner Mongolia to the north, between longitude 105 °29 and latitude 31 °42, with a total area of 205600 square kilometers. China's longitude and latitude reference point, geodetic origin, and Beijing time National time Service Center are located in the province. The topography of Shaanxi Province is high in the north and low in the middle, and is composed of plateaus, mountains, plains and basins, among which the Loess Plateau accounts for 40% of the province's land area, straddling the two major river systems of the Yellow River and the Yangtze River, and across three climatic belts. The Great Wall in northern Shaanxi belongs to the mid-temperate monsoon climate, Guanzhong and