• Tucson
  • Gaogang 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.

Gaogang District is under the jurisdiction of Taizhou City, Jiangsu Province. It is located in the southern half of Taizhou City, bordering the Yangtze River, Hailing District of Taizhou City in the north, Jiangyan District and Taixing City in the east, Jiangdu District of Yangzhou City in the west, and Yangzhong City in the south. The central coordinates of the city are 32 °1906 "north latitude and 119 °52" 33 "east longitude. Gaogang District has a total area of 286.83 square kilometers and a total population of 262905 (by the end of 2012). Gaogang District has jurisdiction over 4 townships, 3 subdistrict offices and 1 provincial high-tech industrial park. Gaogang District is the southern gate of downtown Taizhou and the birthplace of the Navy of the Chinese people's Liberation Army. In the Gaogang area, there are the Yangtze River Port Taizhou Port, the South-to-North Water diversion Project and the Taizhou Yangtze River Bridge. In October 2019, he was selected as the national science and technology in 2019.
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