• Mesa
  • Shawan 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.

Shawan District, which belongs to Leshan City, Sichuan Province, is located in the lower reaches of the Dadu River, the transitional zone between Daxiaoliangshan and Sichuan Basin, between latitude 29 °11 "18" ~ 29 °31 "30" north, longitude 103 °25 °13 "~ 103 °44 °10" east, central district of Leshan City in the north, Muchuan County and Ebian Yi Autonomous County in the south, Wutongqiao District and Jianwei County in the east, and Emeishan City in the west. It covers an area of 610.89 square kilometers and has a registered population of 182300. Under the jurisdiction of 8 towns, 5 townships, 1 street, 127 villages and 21 communities, the district government is located at 95 Desheng Avenue, Shawan Town. Shawan District was called "Nanling" in ancient times, because the Southern Song Dynasty poet Fan Chengda commented that "Nanling" is located in "Lingshan Xiushui, Shaan Bay Ring". In the first year of Tianbao (AD 742), Tongshan Town was set up in Tongjiezi.
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