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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.

Jiuzhi County is a county under the jurisdiction of Guoluo Tibetan Autonomous Prefecture in Qinghai Province and one of the animal husbandry production bases in Qinghai Province. It is located in the southeast of the state, at the junction of Qinghai, Sichuan and Gansu provinces, adjacent to Aba County in Sichuan Province in the southeast, Banma County in the south, Dari County in the west, the Yellow River and Gande County in the northwest, and Maqu County in Gansu Province in the northeast. Jiuzhi established the people's Government of Jiuzhi County in March 1955, which has jurisdiction over 5 townships and 1 town. The total area is 8757.25 square kilometers. As of 2012, the total population of Jiuzhi County is 26000, mainly Tibetan, Han, Hui, Mongolian, Tu and other ethnic groups, of which 24000 are Tibetans, accounting for 95.6% of the total population. There are more than 10 Tibetan Buddhist monasteries in Jiuzhi County. In 2013, the GDP of Jiuzhi County was 269 million yuan, an increase over the same period last year.
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2019 Gannan and Sichuan west chartered car free travel, you will not be able to refuse the trip to the grassland?
Although it is not as famous as Sichuan-Tibet 318, its scenery is no less than that of 318. It is hidden deep in the mountains, and is called "the ess
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