• Tucson
  • Yanyuan 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.

Yanyuan County, which belongs to Liangshan Yi Autonomous Prefecture of Sichuan Province, is located on the southeast edge of the Qinghai-Tibet Plateau in Sichuan Province and on the west bank of the lower reaches of the Yalong River. The geographical coordinates are: longitude 100 °42 °09 "- 102 °03 °44" east and latitude 27 °06 °31-28 °16 °31 "north. Across the Yalong River from Xichang City, Dechang County and Miyi City in the east, Yanbian County in the south, Ningyi County in Yunnan Province in the west, and Muli Tibetan Autonomous County and Mianning County in the north. As of 2012, Yanyuan County covers an area of 8398.6 square kilometers and has a population of 356000. Yanyuan County, which belongs to Sichuan Province, contains 41 kinds of mineral resources, such as salt, iron, gold, etc.; it is rich in many kinds of rare animals, such as black-crowned crane, bear, Swertia, etc., and is rich in apple, Phnom Penh melon seeds and other famous and special products, which is the apple production in southwest China.
Travel Guides In Yanyuan county
Travel Sights In Yanyuan county
Travel Notes In Yanyuan county
2014 Sichuan Lugu Lake Self-driving Tour (10) Lugu Lake, Langfang, Shekua, Shankua, Nawa Villages
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