• Tucson
  • Shandan 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.

Shandan County, which belongs to Zhangye City, Gansu Province, is located in the middle of Hexi Corridor. It is the east gate of Jinzhangye, an important town on Silk Road. It is adjacent to Yongchang to the east, Qinghai to the south and Alashan right Banner in Inner Mongolia to the north. It is 148km long from north to south and 89km wide from east to west, with a total area of 5402 square kilometers. Shandan County is 15505,4441 meters above sea level, surrounded by mountains on three sides, high in the southeast and low in the northwest, with a continental cold and semi-arid climate. The economy of Shandan County is mainly agriculture and animal husbandry, with 857000 mu of arable land and 460000 mu of perennial cultivated area. It is a semi-agricultural and semi-pastoral county. The county is rich in tourism resources, there are national 4A scenic spots, "Expo Holy Land" Yanzhi Mountain Forest Park. It has the largest military racecourse in Asia, Shandan Army Racecourse, which has become the location shooting venue for many films. Famous Buddhist temples
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