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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.

Danjiangkou City, a county-level city under the jurisdiction of Hubei Province, is hosted by Shiyan and is located in the northwest of Hubei Province and the middle and upper reaches of the Hanjiang River. It is known as "Water Capital of China and Tianchi of Asia". It is the core water source area and dam area of the middle route of the South-to-North Water transfer Project, and it is the location of Wudang Mountain, the world cultural heritage and Taoist shrine. Danjiangkou has a long history and culture. When the Danjiangkou Water Control Project was built in 1958, the old county was completely submerged. The current site is built according to the dam, which is named because it is located at the mouth of the Danjiang River into the Han River. Danjiangkou City is the dam area of the middle route of the South-to-North Water transfer Project (Danjiangkou Dam), the reservoir area and the main resettlement area. The city has World Cultural Heritage, national 5A scenic spots, Taoist shrine-Wudang Mountain, water diversion source of the middle route of South-to-North Water transfer Project and national scenic spot-Danjiangkou Reservoir. The total area of the city is 3121 square meters.
Airport In Danjiangkou - Shiyan Wudang Mountain Airport
Shiyan Wudangshan Airport (Shiyan Wudangshan Airport; IATA: WDS, ICAO: ZHSY) is located in Bailang Economic and Technological Development Zone, Shiyan City, Hubei Province, China, about 15 kilometers from the urban area, and about 25 kilometers from the Wudang Mountain Scenic Spot, a famous Taoist holy place in China. It is a 4C-level civil transport airport and a feeder airport in China.  
Shiyan Wudangshan Airport was officially completed and opened to navigation on February 5, 2016, and was named Shiyan Wudangshan Airport.  
According to information on the airport's official website in April 2019, Shiyan Wudangshan Airport has a terminal building, not T1 (domestic in China), with a total area of ​​16,400 square meters; a runway with a length of 2,600 meters; 7 parking spaces (2 Helicopter slots); can guarantee an annual passenger throughput of 1.2 million person-times, an annual cargo and mail throughput of 2,700 tons, and an annual aircraft take-off and landing of 16,173 sorties   . As of April 2019, a total of 17 domestic fixed routes have been opened in China, covering 26 cities   .
In 2018, the passenger throughput of Shiyan Wudangshan Airport was 1.1825 million passengers, a year-on-year increase of 36.0%; the cargo and mail throughput was 0.5 million tons; 112 bits   .
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