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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.

Dari County, under the jurisdiction of Guoluo Prefecture, Qinghai Province, is located in the southeast of Qinghai Province and in the south of Guoluo Tibetan Autonomous Prefecture at the junction of Sichuan, Gansu and Qinghai provinces. It is bordered by Jiuzhi County in the east, Banma County in the southeast, Seda County in Sichuan Province in the south, Shiqu County in Sichuan Province in the southwest, Maduo County in the northwest, and Maqin and Gande counties in the north across the Yellow River. The county has a total area of 16466 square kilometers and has jurisdiction over 9 townships, 1 town, 33 animal husbandry committees, 109 animal husbandry cooperatives and 1 poverty alleviation association, with a total population of more than 30, 000 people (2013). Dari County, with an average elevation of more than 4200 meters above sea level, belongs to an alpine and semi-humid climate, and is one of the natural ecological protection and management areas of the "three Rivers Source". At the same time, it is also an important commodity in Guoluo Prefecture, second only to the location of the prefecture (Dawu), the distribution center of Chinese and Tibetan medicinal materials and Qingchuan Jiao.
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