• Tucson
  • Dongyuan 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.

Dongyuan County, under the jurisdiction of Heyuan City, Guangdong Province, is located in the northeast of Guangdong Province, the middle and upper reaches of Dongjiang River. It is adjacent to Longchuan County of Heyuan City and Wuhua County of Meizhou City to the east, Heping County and Lianping County to the north, Yuancheng District and Zijin County to the south, Longmen County of Huizhou City and Xinfeng County of Shaoguan City to the west, which is the joint of the Pearl River Delta and the mountains of northern Guangdong. Dongyuan County, formerly the suburb of Heyuan County and Heyuan City, was renamed Dongyuan County in November 1993. Xiantang Town, the county government, is the second largest county in Guangdong Province and belongs to Hakka cultural areas. Dongyuan County is located between 23 °22 °N and 24 °15 °N, 114o 19'- 115o 22'E, 130km from east to west and 66.6km from north to south, covering an area of 4070 square kilometers. it has a total population of 590000 and has jurisdiction over 20 towns and one she township. Beijing-Kowloon Railway
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