• Mesa
  • Weiyuan 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.

Weiyuan County, which belongs to Neijiang City, Sichuan Province, is located in the northwest of Neijiang City, in the middle and south of Sichuan Basin, between latitude 29 °22 °north and longitude 104 °53 'east. It is bordered by Shizhong District of Neijiang City to the east, Daan District and Gongjing District of Zigong City to the south, Rong County of Zigong City to the west, Zizhong County to the north, Renshou County of Meishan City and Jingyan County of Leshan City to the northwest. Weiyuan County covers an area of 1289 square kilometers and has jurisdiction over 14 towns with a total population of 728422 (2016). In 2016, Weiyuan County achieved a regional GDP of 31.74 billion yuan, an increase of 7.7 percent over 2015, with a per capita GDP of 53409 yuan. The transportation in the territory is convenient, and it runs through the north-south highway and the Neiwei Rong highway.
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