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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.

Yanshan District is under the jurisdiction of Guilin City, Guangxi Zhuang Autonomous region. The urban division of Guilin was established at the end of 1996. It is located in the south of Guilin City and is one of the six urban areas of Guilin City. It is connected with Lingchuan County in the east, Lingui District in the west, Yangshuo County in the south and Xiangshan District and Qixing District in the north. In Yanshan District, there are Guiyang Highway, Guizhu Highway and Guimo Highway in parallel, while Guiwu Expressway, Lingsanhuan Expressway and Yongyan Secondary Highway pass through. In 2012, Yanshan District has jurisdiction over 1 street, 2 towns and 2 townships, with an administrative area of 288 square kilometers. At the end of 2012, the population was 73900, with a natural population growth rate of 6.4 ‰. The GDP of the region reached 2.088 billion yuan in the whole year. In 2012, the total output value of Yanshan District was 2.088 billion yuan, of which the added value of the primary industry was 439 million yuan.
Airport In Yanshan Qu - Guilin Liangjiang International Airport
Guilin Liangjiang International Airport (Guilin Liangjiang International Airport, IATA: KWL, ICAO: ZGKL), located in Liangjiang Town, Lingui District, Guilin City, Guangxi Zhuang Autonomous Region, China, 28 kilometers away from the center of Guilin, is a 4E-class civil international trunk airport    , is an international tourism aviation hub, an important international airport connecting the new north-south land passage of the "Belt and Road" and facing ASEAN countries, and the only port in Guangxi that implements a 72-hour transit visa-free policy     .
In September 1991, the project was formally approved by the State Council and the Central Military Commission, and construction started in July 1993. On October 1, 1996, Li Peng, then Premier of the State Council of the People's Republic of China, cut the ribbon in person, and Liangjiang International Airport was officially completed and open to navigation; on September 30, 2018, the second phase of construction was completed, and the T2 terminal of Guilin Liangjiang International Airport and Guangxi Zhuang Autonomous Region were established. The 60th anniversary will be opened at the same time.  
According to the information on the airport's official website in July 2018, Guilin Liangjiang International Airport has two terminals, the main operating base of Guilin Airlines, with a total area of ​​155,600 square meters, a runway length of 3,200 meters, and a passenger apron of 574,500 square meters. 51 seats (including 2 seats on 4F), 31 boarding bridges, 76 navigable cities, and 112 domestic and foreign routes   .
In 2019, the passenger throughput of Guilin Liangjiang International Airport was 8.5526 million passengers, a year-on-year increase of -2.1%; the cargo and mail throughput was 30,300 tons, a year-on-year increase of 12.0%; the number of takeoffs and landings was 68,100 vehicles, a year-on-year increase of -4.5%; 40th, 46th, 49th   .
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