• Tucson
  • Gong County

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.

Gong County is a county under the jurisdiction of Yibin City, Sichuan Province. It is located in the south of Yibin City, between longitude 104 °38mm muri 105 °02' and latitude 27 °53mm Mel 28 °31', north is bounded by Gaoxian County, 46 km away from Cuiping District, Yibin City, south by Daxueshan, 69 km away from the county seat of Weixin County, Yunnan Province, west by Yunlian County, southeast and northeast by Xingwen County and Changning County. The county government is stationed in the town, 56 kilometers away from the municipal government. There are trunk highways such as Xugao Highway, Chuanyun Highway and Yiwei Highway connecting Yunnan, Guizhou and Sichuan provinces in Gongxian County. Chengyi Railway and Jinyun Railway run through the county, which is an important transportation hub and material distribution center in the south of Yibin City. The high-grade cement road goes directly to the urban area of Yibin City and can reach Yibin Airport and Yangtze River Shipping Terminal within 1 hour. Gong County is important in Sichuan Province.
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