• Tucson
  • Gangnan District

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.

Gangnan District is under the jurisdiction of Guigang City, Guangxi Zhuang Autonomous region. it is a county-level district established after the prefecture-level Guigang City was established in 1996. It is located on the banks of the Yuhe River in the Xijiang Valley of the Golden Waterway, southeast of Guigang City, on the south bank of Yujiang River, adjacent to Xingye County in the east, Pubei County in the south, Hengxian County in the west, and Gangbei District and Guiping City in the north. In the southern part of Hong Kong, there are double tracks of Li-Zhan Railway and National Highway 324, Nanning-Guangzhou Expressway runs through the whole territory, and the Xijiang River in the golden waterway flows through four villages and towns in the area, and it can pass through thousand-ton freighters all the year round, directly to Guangdong, Hong Kong and Macao. It is an important transportation hub in Guangxi and an important channel for the export of materials in the southwest. By the end of 2010, Hong Kong South District has a total area of 1089 square kilometers and has jurisdiction over 6 towns, 2 townships and 1 street, 165 village committees with a population of 635600.
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