• Tucson
  • Seni 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.

Seni District, which belongs to Naqu City, Tibet Autonomous region, is the political, economic, cultural, transportation, information and communication center of Naqu City. Seni District is bordered by Dangxiong County to the south, Nierong County and Ando County to the north, Biru County and Jiali County to the east, and Bangor County to the west. Xeni District is located in north-central Tibet, between Mount Tanggula and Nianqing Tanggula Mountains, both belong to the northern Tibetan plateau, with an average altitude of more than 4500 meters and a maximum elevation of 6500 meters. The maximum distance from east to west is 233km, and the maximum distance from north to south is 185km, with a total area of 16195 square kilometers. In 2016, the total population of Xeni District was 144116. In 2016, Seni District achieved a GDP of 2.267 billion yuan. In August 2011, Naqu County (Seni District) was awarded the hometown of Chinese specialty (yak).
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