• Mesa
  • Huanxian County

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.

Huanxian County, which belongs to Qingyang City, Gansu Province, is located in the east and northwest of Gansu Province, between 36 °1 & #39;-37 °9 & #39;, east longitude 106 °21 & #39;-107 °44 & #39;, east of Huachi County of Gansu Province and Dingbian County of Shaanxi Province, Qingcheng and Zhenyuan County of Gansu Province to the south, Yuanzhou District and Tongxin County of Guyuan City of Ningxia in the west, and Yanchi County of Ningxia to the north. It is about 124km wide in the east and west and 127km in length from north to south, with a total area of 9236 square kilometers. As of 2017, the total population is 361000, mainly Han nationality, including Hui, Mongolian, Tibetan, Uygur, Miao, Yi, Zhuang, Buyi, Korean, Manchu and Dong.
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