• Tucson
  • Yuncheng 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.

Yuncheng District, which belongs to Yunfu City, is located in the central and western part of Guangdong Province, on the south bank of the middle reaches of the Xijiang River, high in the southwest and low in the northeast, bordering Zhaoqing in the east, Yunan District in the west, Xinxing County in the south and Xijiang in the north. Jurisdiction over 4 streets and 4 towns. By the end of 2018, the total population of the region will be 350000, including more than 55000 compatriots from Hong Kong, Macao and Taiwan and overseas Chinese living overseas. The 324 National Highway and the Yunyao branch of Sanmao Railway crisscross. Yuncheng District has a superior geographical environment and belongs to the subtropical monsoon area with mild climate and abundant rainfall. The region is rich in mineral resources, known as "sulfur capital" and "hometown of dolomite". There are more than 50 kinds of proven mineral deposits, among which pyrite reserves and grade rank first in the world, and marble, granite and limestone reserves are also very large. Panlong Cave in the city is a provincial scenic spot.
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