• Tucson
  • Dantu District

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.

Dantu District, Zhenjiang Municipal District, Jiangsu Province. Located in the southwest of Jiangsu Province, around the city of Zhenjiang. The geographical coordinates are 119 °15mm east longitude 119 °45m, and latitude 31 °15mm 32 °16 'north. The east and north are respectively across the river from Yangzhong, Yangzhou and Yizheng, with Danyang in the southeast, Jintan in the south and Jirong in the west. The area is 611 square kilometers. At the end of 2011, the total registered population was 286700. The district people's government is stationed in Guyang town. The topography is high in the southwest, low in the northeast, and the residual vein of Yanmaoshan in the south, with Ningzhen mountains in the middle, undulating hills and multi-stage terraces; the polder area is magnanimous in the east and north, and the geomorphology can be roughly divided into four types: low mountains and hills, river terraces, interhilly valleys and alluvial plains. In October 2018, it was selected as the "Top 100 area of New urbanization quality in 2018".
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