• Tucson
  • Coqen County

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.

Cuoqin County is a county in the southeast of Ali region of Tibet Autonomous region, 1079 kilometers away from Lhasa. The geographical coordinates are 31 °00' in latitude 30 °51 in north and 85 °19 in longitude 85 °09 in east longitude. There are many lakes and abundant water sources in the territory. "Cuoqin" means "Great Lake" in Tibetan and gets its name from the Great Saline Lake, which is located more than 10 kilometers east of the county. With an average elevation of more than 4700 meters, it is one of the few high-altitude counties. The government is stationed in Mendong village, Cuoqin town. The territory covers an area of 22000 square kilometers with a total population of 13200 (2013). The second lane of the Singapore-Tibet Highway is passed. Cuoqin County is rich in animal product resources and is one of the pure animal husbandry counties in Tibet and Ali region. The permanent residents are all Tibetans and believe in the Bai religion in Tibetan missionaries, and a small number of them
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