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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.

Dongan District is under the jurisdiction of Mudanjiang City, Heilongjiang Province, which is located in the southeast of Mudanjiang City. It was built in January 1958. It is adjacent to Aimin District by Binsui Railway in the north, and Xi'an District by Taiping Road in the west. The east and south are connected to Yangming District, Muling City and Ning'an City respectively. In 2006, the region's full-caliber added value, sales income, total output, profits and taxes, and profits reached 1.02 billion yuan, 3.49 billion yuan, 2.76 billion yuan, 270 million yuan and 160 million yuan respectively, up 0.9 percent, 1.7 percent, 0.8 percent, 1.4 percent and 1.1 percent respectively over 2005. The proportion of primary, secondary and tertiary production in the region was adjusted to 6:35:59. As of 2013, the administrative area is 294.2 square kilometers, and the total urban area is 5.2 square kilometers.
Airport In Dong'an District - Mudanjiang Hailang International Airport
Mudanjiang Hailang International Airport (Mudanjiang Hailang International Airport, IATA: MDG, ICAO: ZYMD), located in the southwest suburb of Mudanjiang City, Heilongjiang Province, China, 9 kilometers away from the center of Mudanjiang, is a 4C-level military-civilian joint international feeder airport and one of the country's opening-up class air port   .
On September 2, 1985, Mudanjiang Hailang Airport was officially open to navigation; in December 1998, Mudanjiang Hailang Airport was officially opened to the public with the approval of the State Council; on August 21, 2017, Mudanjiang Hailang Airport was officially renamed as Mudanjiang Hailang International Airport   .
As of February 2020, the terminal area of ​​Mudanjiang Hailang International Airport is 8,200 square meters, with 2 boarding gates; the area of ​​the civil aviation station is 38,000 square meters, with 4 seats; one is 2,600 meters long and 45 meters wide The asphalt runway can take off and land Boeing B737-800 and below; it can meet the needs of annual passenger throughput of 500,000 passengers   .
In 2019, Mudanjiang Hailang International Airport handled a total of 1,048,088 passengers, a year-on-year increase of 12.2%, ranking 103rd in the country; cargo and mail throughput was 1,290.0 tons, a year-on-year increase of 4.3%, ranking 112th in the country; aircraft took off and landed 8,128 sorties , a year-on-year increase of 8.9%, ranking 139th in the country   .
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Travel Asks In Dong'an District