• Tucson
  • Langya

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.

Langya District, which belongs to Chuzhou City, Anhui Province, was named Langya District because of Langya Mountain and the original Langya Township in Chuzhou. It was established on January 18, 1993. It is located in the east of Anhui Province, the north bank of the lower reaches of the Yangtze River, the southeast of Chuzhou, about 50 kilometers southeast of Nanjing and 100 kilometers west of Hefei, the provincial capital. The region covers an area of 180.79 square kilometers and has a resident population of 310000. By the end of 2013, it had jurisdiction over 10 directly administered communities and provincial-level Langshan Economic Development Zone. The area belongs to the north subtropical monsoon climate, the annual average temperature is 15.2 degrees Celsius, and the air quality reaches the national second-class standard all the year round. The main scenic spots are Langya Mountain Scenic spot, Zuiweng Pavilion, Fengle Pavilion, Xijian Lake, Qingliu River and so on. Langya District is a member of "Yangtze River Delta Urban agglomeration" and one of the core areas of "Nanjing Metropolitan area".
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