• Tucson
  • Baijiantan 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.

Baijiantan District is the municipal district of Karamay City, Xinjiang, 30 kilometers northeast of the city. In 1956, when the oil workers explored here, they saw that there was a vast expanse of saline and alkali everywhere, hence the name. Baijiantan area is located in the northwest margin of Junggar Basin, bordering Tori County in the north, Buxel County in the south, Karamay District in the southwest and Wuerhe District in the northeast, with a total area of 1272 square kilometers. Most of the landforms are Gobi (desert), which is located in the typical continental climate zone of mid-temperate zone. In 2016, the local GDP of Baijiantan District was 2.12 billion yuan. Of this total, the added value of the primary industry was 60 million yuan, the secondary industry was 910 million yuan, and the tertiary industry was 1.15 billion yuan. By the end of 2017, Baijiantan District had jurisdiction over two streets and one town, with a total of 20 community neighborhood committees and 5 administrations.
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