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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.

Donggang District belongs to Rizhao City, Shandong Province. Bordering the Yellow Sea, it is located in the middle of the Chinese mainland coastline, with the south wing of Shandong Peninsula, Qingdao to the north and Lianyungang to the south, facing Japan and South Korea across the sea. The total area is 1507 square kilometers. Donggang District, founded in December 1992, is the resident area and main urban area of Rizhao City. It is located at the confluence of the coastal main axis developed by the state and the economic belt along the new Eurasian Continental Bridge, and the combination of the economic circle around the Yellow Sea and Bohai Sea and the economic circle of the Yangtze River Delta. It is an important node city of the national "Belt and Road Initiative" strategic planning and the "two zones, one circle" strategy of Shandong Province. In 2018, Donggang District has jurisdiction over 5 streets and 7 towns, with a total registered population of 741800, with a gross domestic product (GDP) of 57.04 billion yuan, of which the primary industry is realized.
Airport In Donggang Area - Rizhao Shanzihe Airport
Rizhao Shanzihe Airport (IATA: RIZ, ICAO: ZSRZ) is referred to as Rizhao Airport; it is located in Shanzihe, Houcun Town, Donggang District, Rizhao City, Shandong Province, China, 19 kilometers away from the center of Rizhao.  
Rizhao Shanzihe Airport was officially opened to navigation on December 22, 2015, and was named Rizhao Shanzihe Airport.  
According to the information on the airport's official website in March 2019, Rizhao Shanzihe Airport has a terminal building, T1 (domestic and international in China), with a total area of ​​22,000 square meters; a runway with a length of 2,600 meters; and 6 parking spaces , Cargo flat 3789 square meters   ; It can guarantee an annual passenger throughput of 900,000 person-times, a cargo and mail throughput of 4,500 tons, and an aircraft take-off and landing of 10,000 sorties   ;As of October 2019, Rizhao Shanzihe Airport has opened a total of 15 domestic routes in China and 21 navigable cities   .
In 2018, the passenger throughput of Rizhao Shanzihe Airport was 901,200 passengers, a year-on-year increase of 22.2%; the cargo and mail throughput was 1,400 tons, a year-on-year increase of 41.1%; the number of takeoffs and landings was 79,500 vehicles, a year-on-year increase of 83.4%; 101st, 99th, 44th.  
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