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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.

Dongxing, a county-level city under the jurisdiction of Guangxi Zhuang Autonomous region, is located in the southwestern border of China and southern Guangxi, bordering the Beibu Gulf in the southeast and Vietnam in the southwest. In 1996, Dongxing became a county-level city. In 2012, the city has jurisdiction over 3 towns, 31 administrative villages and 10 communities, with a land border of 39 km, a coastline of 50 km, an area of 590 square kilometers and a resident population of 157100 (2016). Dongxing has Beilun Estuary Mangrove Reserve, one of the three major mangrove demonstration reserves in the world, and national 4A scenic spots such as Beijing Island Scenic spot and Pingfeng Rainforest Park. there are historical and cultural landscapes such as the No. 1 boundary monument of Daqing, the people's Friendship Park between China and Vietnam, and the former residence of Chen Jitang, the "Southern Heavenly King" of the Republic of China. At the second China Tourism Forum in 2008, Dongxing City was awarded "China"
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