• Tucson
  • Longgang 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.

Longgang District is an area under the jurisdiction of Huludao City, Liaoning Province, which is located on the northern seashore of Bohai Sea and on a peninsula on the coast of Liaodong Bay. The total area is 172 square kilometers and the total population is 220000. Longgang District is an industrial area dominated by smelting and shipbuilding. Railway, sea transportation and air transportation constitute a three-dimensional transportation network. Through Haichen Road, Coastal Road and Jinghu Road, it is equal to Lianshan District, and then it is connected with Beijing-Harbin Expressway and National Highway 102. the railway Hulu branch line is connected with Huludao Station of Shenshan Line; the coastal highway of Liaoning Province, with a total length of more than 1440 kilometers, passes through Longgang District, which is 30 kilometers east of Jinzhou Airport; the Huludao Port in the area can park cargo ships below 50,000 tons, which is a natural ice-free port in northern China. The coastline of the region is 54.5 kilometers long and is rich in all kinds of aquatic products.
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