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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.

Lingao County, which belongs to Hainan Province, is located in the northwest of Hainan Island. Lingao County is located in the northwest of Hainan Island, located at 19 °34 degrees north latitude, 20 °02 degrees east longitude, 109 °3 degrees east longitude. It is bordered by Chengmai County to the east, Danzhou City to the southwest, Beibu Gulf to the northwest, Qiongzhou Strait to the north, and Leizhou Peninsula across the sea. The county government is stationed in Lincheng City, 83 kilometers away from the provincial capital Haikou City. The territory is 34 kilometers wide from east to west and 47 kilometers from north to south. The administrative area covers an area of 1317 square kilometers. The county seat is 82 kilometers away from the provincial capital Haikou. It has jurisdiction over 10 towns, 1 farm (Calais Farm), 2 development zones (Golden Port Economic Development Zone, Lingaojiao Tourism and Holiday Development Zone), 176village committees and 880 natural villages with a population of 515000 (as of 2018).
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