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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.

Qianzhong, known as Baoning in ancient times, is a county-level city hosted by Nanchong City, Sichuan Province. it is located in the northeast of Sichuan Basin, in the middle reaches of Jialing River, at the southern foot of Qinba Mountain, surrounded by mountains and water in three directions. It is bordered by Bazhong City and Yilong County in the east, Nanbu County in the south, Jiange County in the west and Cangxi County in the north. For more than 2000 years, it has been an important military town for Bashu. Langzhong City covers an area of 1878 square kilometers and has jurisdiction over 5 streets, 19 towns and 4 townships, with a total population of 859192 (2016). It is a demonstration city of ecological construction in China, an excellent tourist city in China, a thousand-year-old county in the world, and the hometown of Chinese Spring Festival culture. Yuanzhong is known as "Langyuan Wonderland" and "Ba-Shu wants to rush". Du Fu, a poet of the Tang Dynasty, left a famous saying here that "the world is rare in the south of Langzhou". The territory is home to China's four most well-preserved
Travel Guides In The Ancient City of Langzhong
Travel Sights In The Ancient City of Langzhong
Travel Notes In The Ancient City of Langzhong