• Tucson
  • Jiange 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.

Jiange County, which belongs to Guangyuan City, Sichuan Province, is located at the northern edge of Sichuan Basin, the junction of Sichuan, Shaanxi and Gansu provinces, located in the north of Sichuan Province and the southwest of Guangyuan City, guarding the natural danger of Jianmen. "Jiange is towering and towering into the clouds, as long as it is guarded by one person, thousands of troops are difficult to capture." it is known as "the Golden Triangle of Northern Sichuan" and "the Pearl of Shu Road". The county covers an area of 3204 square kilometers and has jurisdiction over 27 towns and 30 townships, with a total registered population of 657700 at the end of 2017. Dangde County was first established at the end of the Eastern Han Dynasty, and Nanan County was set up in Pu'an Town in the Northern and Southern dynasties during the Liu Song Dynasty. After the reform, Jianzhou was changed to Jiange County in 1913, and the county seat moved to Xiasi Town in September 2003. The work of withdrawing counties and building cities was officially launched in April 2015, and it is planned to complete the declaration of Jianmenguan City at the county level in 2017. Beijing and Kunming
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Travel Notes In Jiange County