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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.

Nianzishan District, Qiqihar City, Heilongjiang Province is a municipal district, located in the eastern foot of Daxing'an Mountains, located in the westernmost part of Qiqihar, about 90 kilometers away from the central city, 113 kilometers away from the railway. It is adjacent to Longjiang County in the east, south and west, Gannan County in the northeast and Zhalantun City in Inner Mongolia in the northwest. The geographical coordinates are 47 °29 "N" 47 °41 "N, 122 °53" E and 123 °05'E. The area is long from north to south, narrow from east to west, and the center is slightly prominent, which is an irregular diamond shape. As of 2013, the total area is 357 square kilometers, the cultivated land area is 170000 mu, and the urban area is 9 square kilometers. As of 2013, the total population is 81000, of which the urban population is 56000, under the jurisdiction of 4 subdistrict offices and 9 administrative villages. two
Airport In Nianzishan District - Qiqihar Sanjiazi Airport
Qiqihar Sanjiazi Airport (Qiqihar Sanjiazi Airport, IATA: NDG, ICAO: ZYQQ), located on Damintun Airport Road, Longsha District, Qiqihar City, Heilongjiang Province, China, 10.5 kilometers north of Qiqihar City Center, is a 4C-level military-civilian joint feeder airport, Temporary air ports open to the outside world   .
On May 16, 1988, Qiqihar Sanjiazi Airport officially opened for civil aviation business   ; In June 1993, Qiqihar Sanjiazi Airport became a temporary port airport   ; In 2012, Qiqihar Sanjiazi Airport terminal corridor bridge opened   ; On June 26, 2022, the west runway of Qiqihar Sanjiazi Airport will be opened [twenty three]  .
According to comprehensive news in May 2020, the terminal area of ​​Qiqihar Sanjiazi Airport is 8,000 square meters, including 4,000 square meters for the International Joint Inspection Office.   , two of which are close to the plane; the east runway is 2,600 meters long and 45 meters wide, and the west runway (military) is 3,000 meters long and 50 meters wide; it can meet the annual passenger throughput of 600,000 passengers.     .
In 2021, Qiqihar's three sub-airports will handle a total of 390,683 passengers, a year-on-year increase of 5.4%, ranking 147th in the country; cargo and mail throughput will be 701.8 tons, a year-on-year increase of 85.2%, ranking 135th in the country; aircraft take-offs and landings will be 3,692, A year-on-year decrease of 5.2%, ranking 181st in the country   .
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