• Mesa
  • Changwu  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.

Changwu County, which belongs to Xianyang City, Shaanxi Province, is located in the west of Guanzhong and on the south side of the middle reaches of Jinghe River in the northwest of Xianyang City. It is adjacent to Bin County in the east, Lingtai County in Gansu Province to the south, Jingchuan County in Gansu Province to the west, and Ningxian County and Zhengning County in Gansu Province to the north. Between longitude 107 °38 "49"-107 °58 "02" east and latitude 34 °59 °09 "- 35 °18" 37 "north. The longest point from north to south is 30.06km, and the widest from east to west is 27.23km, with a total area of 567.1 square kilometers. In 2018, Changwu County has jurisdiction over 1 street and 7 towns. At the end of 2016, the resident population of Changwu County was 170878, with a regional gross domestic product (GDP) of 7.2999 billion yuan, of which the added value of the primary industry was 15.86.
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