• Tucson
  • Luding 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.

Luding County, located in the southeast of Ganzi Tibetan Autonomous Prefecture in Sichuan Province, is located in the transitional zone from Qinghai-Tibet Plateau to Sichuan Basin, bordering Tianquan and Laojing in the east, Kangding and Kowloon in the west, and Shimian County in the south. The county is 236.2 kilometers away from Chengdu and 49 kilometers away from Kangding. The county seat is 1321 meters above sea level, with 7 towns, 5 townships and 145 administrative villages within its jurisdiction, covering an area of 2165.35 square kilometers. It is inhabited by 17 ethnic groups, including Han, Tibetan and Yi, with a total population of 87065 at the end of 2017. It is a mountainous multi-ethnic county with the smallest land area, relatively high population education, the densest population and rapid economic development. it is also a regional trade center in the eastern part of Ganzi Prefecture and a supply base for agricultural and sideline products in various counties in Ganzi Prefecture. It is known as the "Dongda" of Ganzi Prefecture.
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Travel Asks In Luding County