• Mesa
  • Qianfeng District

A mesa is an isolated, flat-topped elevation, ridge or hill, which is bounded from all sides by steep escarpments and stands distinctly above a surrounding plain. Mesas characteristically consist of flat-lying soft sedimentary rocks capped by a more resistant layer or layers of harder rock, e.g. shales overlain by sandstones. The resistant layer acts as a caprock that forms the flat summit of a mesa. The caprock can consist of either sedimentary rocks such as sandstone and limestone; dissected lava flows; or a deeply eroded duricrust. Unlike plateau, whose usage does not imply horizontal layers of bedrock, e.g. Tibetan Plateau, the term mesa applies exclusively to the landforms built of flat-lying strata. Instead, flat-topped plateaus are specifically known as tablelands.

Qianfeng District, which belongs to Guang'an City, Sichuan Province, was established on August 8, 2013. It is located in the east of Guang'an City, Sichuan Province, west of Huaying Mountain, east of Qujiang River, a secondary tributary of the Yangtze River, west and north of Guang'an District, south of Huaying City and Linshui County, and east of Dazhu County of Dazhou City. Between latitude 30 °26 "15.02"-30 °39 "8.05" north and longitude 106 °38 "36.14"-106 °59 "14.30" east. The Vanguard Zone covers an area of 504sq km and has jurisdiction over 4 streets, 8 towns and 2 townships. In 2015, the resident population was 256000 (household registered population was 368000). In 2015, the region's gross domestic product (GDP) reached 15.06 billion yuan, an increase of 11.2% over 2014 at comparable prices.
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