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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.

Hot Spring County, which belongs to Bortala Autonomous Prefecture of Xinjiang Uygur Autonomous region, is located in the northwest of Xinjiang, the upper reaches of Bortala River, the northern foot of the western part of Tianshan and the western margin of Junggar Basin. It is bordered by Bole to the east, Zhentao Mountain to the south and Huocheng County to the south, and Kazakhstan to the west and north to Kongguoro Obo Mountain and the western part of Alatao Mountain respectively. The county is 139.4 km long from east to west and 64.8km wide from north to south. The area of arable land is 490000 mu, the area of grassland is 6.19 million mu and the forest is 551000 mu. The climate here is warm in winter and cool in summer, with an annual average temperature of 3.6 degrees Celsius. The total annual diameter of surface water is 800 million cubic meters, the groundwater reserves are 310 million cubic meters, and the theoretical water energy reserves are 279000 kilowatts. The population in 2012 was 74600. 2018
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