• Tucson
  • Dagzê District

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.

Dazi District, which belongs to Lhasa City, Tibet Autonomous region, is located in the central and southern part of Lhasa, the middle reaches of the Lhasa River, and the east-west Chala Mountains and Guogalari Mountains in the north and south, respectively. Dazi District, 20 kilometers away from Lhasa, is known as the "East Gate" of Lhasa. The average elevation of the whole region is 4100 meters, the lowest elevation of the river valley is 3730 meters, the annual average temperature is 7.5 ℃, the average annual sunshine is 3065 hours, and the average rainfall is 450mm. The total area of the county is 1373 square kilometers, with an area of 68500 mu of cultivated land. As of December 2017, the region has jurisdiction over five townships and one town, with a total population of 30,000. There are 14 temples and Rizu Lakang in Dazi District, among which Gandan Temple, which was built at the beginning of the 15th century and has a history of more than 600 years, is the first of the six major temples of the Gelug sect of Tibetan Buddhism (Huangjiao).
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