• Tucson
  • Xisaishan 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.

Xisaishan District, which belongs to Huangshi City, Hubei Province, is located on the south bank of the middle reaches of the Yangtze River and in the east of Huangshi City. It is bordered by Diyuankou Town, Yangxin County in the east, Nanhu Township in the lower land area in the west, Sike Township and Wangren Town in Daye City in the south, Xishui and Qichun in the north, and Shengyang Port in Huangshi Port District in the northwest. The whole territory is 22.9km long from east to west and 9.945 km wide from north to south. As of 2012, Xisai Mountain area has a total area of 112.39 square kilometers, of which the urban area is 49.95 square kilometers, the suburbs are 62.44 square kilometers, and the population of the whole region is 258000. As of 2013, Xisaishan District has successively won the honorary titles of "National Scientific and technological Progress City" and "National Community Construction demonstration Zone". March 6, 2019, Central propaganda Department, Ministry of Finance, Culture and Brigade
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