• Tucson
  • Yunxiao 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.

Yunxiao County (ancient Yunxiao Hall, Zhangzhou capital) is located on the southern coast of Fujian Province. It is located between 23 °45km north latitude and 117o 07km east longitude, with an area of 1054.3 square kilometers and a population of 416000 (sixth census). The county has Zhangzhao Expressway crossing, 24.8km in the territory, and 400.7 km in the trunk of National Highway 324 and Provincial Highway 210,211. Inland navigation 30 kilometers, coastal ships can directly reach Dongshan, Xiamen and other places, there is Xiamen-Shenzhen railway transit. The topography of Yunxiao County tilts from northwest to south, the northeast, west and southwest edges are mountainous, and the middle to southeast is the coastal plain. The coastline is 48 kilometers long. The Zhangjiang River flows through the county, and Fengtou Reservoir and eastward are built in the upper reaches.
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