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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.

Lanshan District, Rizhao City, Shandong Province is located in the southeast of Shandong Province, facing the Yellow Sea to the east, Junan County and Ju County to the west, Donggang District of Rizhao City to the north, and Ganyu District, Lianyungang City, Jiangsu Province to the south; the total length of the coastline is 25 kilometers, with a total area of 778 square kilometers. By 2018, the registered population of the region was 435800, of which the urban population was 209900. In September 2004, the State Council approved the establishment of Lanshan, a new port area, which will become the city sub-center and port-adjacent industrial base of Rizhao (an emerging port city and a "UN Habitat Award" city). Lanshan has a long history and splendid culture. As early as 3000 years ago in the Shang Dynasty, it was the capital of Ji country. Confucius, the supreme master of Chinese Confucianism, once worshiped Ligularia (later known as "Holy Gong") as his teacher here, and the three-character Classic recorded Xizhong and Ligularia.
Airport In Lanshan district - 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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