• Tucson
  • Gansu

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.

Gansu, referred to as "Gan" or "long", is the provincial administrative region of the people's Republic of China and the capital of Lanzhou. It is located in northwest China, connecting Shaanxi to the east, Xinjiang to the west, Sichuan and Qinghai to the south, Ningxia and Inner Mongolia to the north, and Mongolia to the northwest. It is between 32 °11 miles north latitude 42 °57 miles north and 92 degrees 13 miles east longitude, covering a total area of 425800 square kilometers. The topography of Gansu is long and narrow, with complex and diverse landforms, including mountains, plateaus, flat rivers, river valleys, deserts and Gobi, surrounded by mountains and mountains, and the terrain inclines from southwest to northeast. Gansu is located in the confluence of the Loess Plateau, the Qinghai-Tibet Plateau and the Inner Mongolia Plateau. The climate types from south to north include subtropical monsoon climate, temperate monsoon climate, temperate continental arid climate and plateau.
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