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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.

Zengcheng District is a municipal district of Guangzhou, located in the east-central part of Guangdong Province and the east of Guangzhou, facing Dongguan in the south, Huizhou in the east and Conghua in the north. As of the end of 2017, it covers an area of 1616.47 square kilometers and has a resident population of 1.41 million. It has a state-level economic and technological development zone and "overseas Chinese Mengyuan", the fifth national industrial gathering area for overseas Chinese businessmen. Zengcheng County was built in the Eastern Han Dynasty Jian'an six years (2018), belonging to Nanhai County, because Nanhai County originally under the jurisdiction of six counties, a new county, an additional city, so it is called "Zengcheng". In 1993, counties were removed to set up cities, and in February 2014, cities were withdrawn to set up districts. It has jurisdiction over 4 subdistrict offices, 7 towns, 282 administrative villages and 55 communities with a population of 890800. The Zengcheng Economic and technological Development Zone within its jurisdiction is one of the three national development zones in Guangzhou.
Airport In Zengcheng District - Guangzhou Baiyun International Airport
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