• Tucson
  • Huazhou

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.

Huazhou, a county-level city hosted by Maoming City, Guangdong Province, is located in the southwest of Guangdong Province, in the middle reaches of Jianjiang River, between longitude 110 °21'to 110 °45'E and latitude 21 °29'to 22 °13'N, bordering Beiliu County of Guangxi in the north, Wuchuan City of Guangdong Province in the south, Gaozhou City and Maoming City in the east, and Luchuan County of Guangxi and Lianjiang City of Guangdong Province in the west. The main languages in the territory are Cantonese Zhou dialect and Hakka Ya dialect. Huazhou is one of the famous bases for transporting food from the south to the north in China, and it is known as "the hometown of tangerine in China". There is Fuliang Mountain in the north of Huazhou. There is Longwang Mountain in the northeast, which is also called Anshan. The northern boundary of Maoming lies in the northeast, that is, Dou Jiang. Another northeast Lingshui, originating from the north stream of Guangxi, after entry, qu southwest to Hejiangxu, Luoshui also entered from land and water, collectively known as Luojiang, or
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