• Tucson
  • Huai'an County

Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Huaian County, which belongs to Zhangjiakou City, Hebei Province, is located in the northwest of Hebei Province, at the junction of Shanxi, Hebei and Inner Mongolia provinces (regions). It is located at the intersection of Beijing-Tianjin-Hebei Metropolitan area and Shanxi-Hebei-Inner Mongolia Economic Circle. It is known as the "Golden Triangle". Huaian County has a long history and was established as early as the Spring and Autumn and warring States period. Tang Muzong was called Huaian County in the second year of Changqing, that is, AD 822, with the meaning of "benevolence was implemented by the court and the people were gracious and safe". The county has a vast territory, high in the west and low in the east, belonging to a shallow mountain and hilly area. The area covers an area of 1706 square kilometers, with an available land area of 1.5 million mu, including 600000 mu of arable land. It has jurisdiction over 4 towns and 7 townships, 273 administrative villages, with a population of 246000, including an agricultural population of 178000. Huaian County is known as a "cultural county". In the Ming and Qing dynasties, Jinshi, Juren and students reached more than 400.
Airport In Huai'an County - Zhangjiakou Ningyuan Airport
Zhangjiakou Ningyuan Airport (Zhangjiakou Ningyuan Airport, IATA: ZQZ, ICAO: ZBZJ), located on Airport Road, Qiaodong District, Zhangjiakou City, Hebei Province, China, 9 kilometers away from the center of Qiaodong District, Zhangjiakou City, is a 4C-level domestic branch airport for military and civilian use   .
Zhangjiakou Ningyuan Airport was built in 1935 and was called Yulin Airport at that time; on May 9, 2010, the airport began military-civilian reconstruction project   ;On June 16, 2013, Zhangjiakou Ningyuan Airport officially opened civil aviation business   ; On August 3, 2020, the T2 terminal of Zhangjiakou Ningyuan Airport opened   .
As of February 2021, Zhangjiakou Ningyuan Airport has 2 terminals, of which the T1 terminal covers an area of ​​5,400 square meters and the T2 terminal covers an area of ​​13,900 square meters; the civil aviation station has 14 C-class seats; the runway is 3,000 square meters long. meters and a width of 45 meters; it can meet the needs of an annual passenger throughput of 1 million passengers and 10,700 aircraft takeoffs and landings      .
In 2021, Zhangjiakou Ningyuan Airport will handle a total of 464,638 passengers, a year-on-year decrease of 17.1%, ranking 132nd in the country; cargo and mail throughput will be 39.4 tons, a year-on-year decrease of 43.8%, ranking 196th in the country; A year-on-year decrease of 23.7%, ranking 167th in the country   .
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