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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.

The pass is under the jurisdiction of Xinzhou City, Shanxi Province. Pianguan County was called Linhu in ancient times, it was called Piantouguan and Piantouzhai in ancient times, and it was changed to Piantou County in the Qing Dynasty. Pianguan County is located in the northwest border of Shanxi Province, where the south of the Yellow River flows into Shanxi. It borders Qingshuihe County in Inner Mongolia by the Great Wall in the north, the Yellow River in the west and Zhungeer Banner in Inner Mongolia across the river, Hequ and Wuzhai in the south, and Shenchi and Shuozhou in the east. The county is 60 kilometers long from east to west and 58 kilometers wide from north to south, with a total area of 1682 square kilometers and a total population of 110000 (2004). Piantou pass, Ningwu pass and Yanmen pass, together known as the three passes of China, are the first of the three passes outside the Great Wall in the Ming Dynasty, which are called "the Ping Fan of Sanjin" and "the key of Northern Shanxi". September 25, 2018, obtained
Airport In Pianguan Xian - Xinzhou Wutaishan Airport
Xinzhou Wutaishan Airport (Xinzhou Wutaishan Airport, IATA: WUT, ICAO: ZBXZ), is located in Wuweizhuang Village, Hongdao Town, Dingxiang County, Xinzhou City, Shanxi Province, China. It is 71 kilometers away from the core scenic spot of Wutai Mountain and 38 kilometers away from Xinzhou City. It is a 4C class Military-civilian feeder airports, temporary air port airports   .
In January 2015, Xinzhou military-civilian combined airport was named "Xinzhou Wutaishan Airport"   ;On December 25, 2015, Xinzhou Wutaishan Airport officially opened civil aviation business   ; On July 10, 2019, the air port of Xinzhou Wutaishan Airport was officially opened to the public temporarily   .
As of March 2020, the terminal area of ​​Wutaishan Airport in Xinzhou is 13,340 square meters, with 4 corridor bridges   , 7 check-in counters, 4 security inspection channels; there are 5 seats on the station apron, including 4 class C seats and 1 class B seat; the runway is 2600 meters long and 45 meters wide; it can meet the annual passenger throughput 350,000 passengers, 1,570 tons of cargo and mail, and 4,550 aircraft takeoffs and landings   .
In 2021, Xinzhou Wutaishan Airport will handle a total of 297,052 passengers, a year-on-year increase of 8.4%, ranking 161st in the country; cargo and mail throughput will be 167.3 tons, a year-on-year increase of 32.8%, ranking 176th in the country; aircraft takeoffs and landings will be 4,418, Year-on-year growth of 5.4%, ranking 173rd in the country   .
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