• Mesa
  • Longchang City

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.

Longchang is a county-level city hosted by Neijiang City in Sichuan Province, which is located in the southeast of Sichuan Province and the southern end of Neijiang City. The ground span ranges from 105 degrees 02 to 105 degrees 26 degrees east longitude and from 29 degrees 11 to 29 degrees 32 degrees north latitude. It is adjacent to Rongchang District of Chongqing City in the east, Lu County of Luzhou City in the south, Fushun County of Zigong City and Daan District of Zigong City in the west, Dongxing District in the north, 210 kilometers away from Chengdu and 138 kilometers away from Chongqing. Longchang covers an area of 794.41 square kilometers; it has jurisdiction over 2 streets and 13 towns; it has a total population of 778000 in 2015; in 2015, Longchang achieved a GDP of 23.3 billion yuan and a per capita GDP of 36096 yuan. Belongs to the subtropical humid monsoon climate, the annual average temperature is 17.7 ℃, the frost-free period is 324 days, and the annual rainfall is 10%.
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