• Tucson
  • Longyan City

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.

Longyan City, also known as Minxi, is located in western Fujian, at the junction of Fujian, Guangdong and Jiangxi provinces, Zhangzhou and Quanzhou to the east, Meizhou in Guangdong to the south, Ganzhou in Jiangxi to the west, and Sanming to the north. In May 1997, the land was removed and the city was established. Longyan is an inland city adjacent to the sea. it is a transportation hub and important passage for extending the two wings of the economic zone on the west coast of the Taiwan Strait, connecting the two continents and expanding the hinterland. In the foothills of Cuiping Mountain, 2 kilometers east of Longyan City, there is a karst cave, which is named "Longyan Cave" because of its rock pattern. Longyan City is the only prefecture-level city in China named after the word "Dragon". Longyan City is composed of part of the northern part of ancient Zhangzhou and part of the jurisdiction of Guting State. Longyan is an integral part of China's old revolutionary base and the Central Soviet area. One of the starting points of the long March, the seven counties (cities and districts) are all counties of the Central Soviet area.
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