• Tucson
  • Hanyuan 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.

Hanyuan County, under the jurisdiction of Ya'an City, Sichuan Province, is located in the south of the western part of Sichuan Province, with geographical coordinates between 102 °16 miles east longitude and 29 °05 miles north latitude. It is bordered by Jinkou River District of Leshan City and Hongya County of Meishan City to the east, Ganluo County of Liangshan Yi Autonomous Prefecture in the south, Luding County of Ganzi Tibetan Autonomous Prefecture and Shimian County of Ya'an City to the west, and Yingjing County of Ya'an City to the north; the whole territory is 71.4 km long from east to west and 70.1 km wide from north to south. The county covers an area of 2388 square kilometers, is a subtropical monsoon humid climate, warm in winter and cool in summer, with four distinct seasons. As of 2016, Hanyuan County has jurisdiction over 30 townships (5 ethnic minority townships), and the county seat is located in Fulin Town. As of 2017, Hanyuan County has a total population of 319300. Hanyuan County, the ancient name of Yidu, belongs to
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