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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 Friendship Zone (Bureau) is a regional bureau with the integration of government and enterprises in Yichun City, Heilongjiang Province, and it is one of the four central urban areas in Yichun City. The Friendship Zone (Bureau) is located in the northeast of Heilongjiang Province and at the southern foot of the middle part of Xiaoxingan Mountains. The geographical coordinates of the friendly area (bureau) are 128 °07 °34 "~ 128 °59 °53" east longitude and 47 °45 °56 "~ 48 °33" 25 "north latitude. The Friendship Zone (Bureau) has a total area of 2347.55 square kilometers and a total population of 66000 (2010). The Friendship Zone (Bureau) has jurisdiction over 3 streets, 6 forest farms and 8 management offices. The friendly zone (bureau) belongs to the continental humid monsoon climate zone of the north temperate zone, which has scenic spots such as Old Spring, Milk Shadow Island, UFO shooting training ground and so on. Production in friendly areas (bureaus) in 2013
Airport In You Hao - Yichun Lindu Airport
Yichun Lindu Airport (Yichun Lindu Airport, IATA: LDS, ICAO: ZYLD), located in Lindu Village, Yilin Management Office, Yimei District, Yichun City, Heilongjiang Province, China, is 9 kilometers away from the center of Yichun City. It is a 4C-level domestic feeder airport   .
Yichun Lindu Airport started construction in July 2008 and officially opened to air on August 27, 2009   ;The reconstruction and expansion project started in July 2018, and the completion and acceptance of the reconstruction and expansion project will be completed in December 2019   .
According to the official Weibo of the airport in March 2020, the terminal area of ​​Yichun Lindu Airport is 9,139 square meters, the station area is 52,800 square meters, and there are 8 C-class seats; the runway is 2,800 meters long and 45 meters wide, which can take off and land Models below the A320 series and B737 series can meet the needs of passenger throughput of 600,000 passengers     .
In 2019, Yichun Lindu Airport handled a total of 161,776 passengers, a year-on-year decrease of 0.2%; cargo and mail throughput was 26.2 tons, a year-on-year decrease of 33.9%; aircraft took off and landed 1804 sorties, a year-on-year decrease of 0.8%   .
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