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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.

Banma County is located in the southeast of the state border, bordering Sichuan Province in the east and south. The county government is located in Moba Township, 315 kilometers away from the state capital. The population is 27000 (2007), mainly Tibetans, accounting for more than 95% of the total population, as well as Han, Hui, Turkish and other ethnic groups. It covers an area of 6376 square kilometers and has jurisdiction over 8 townships and 1 town. The annual average temperature in Banma County is-1.0-2.8 ℃. With the increase of altitude, the temperature decreases gradually. In terms of the annual change of air temperature in Banma County, the monthly average temperature is the highest in July, and the monthly average temperature is 11 ℃. In January, the monthly average temperature is-9.8 ℃, but it is characterized by rapid warming and rapid cooling, and the cooling range is greater than the warming range. Banma County has a total land area of 6138 square kilometers, accounting for 8.03% of the total area of the state. The grassland area is 396700 hectares.
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