• Mesa
  • Gao 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.

Gao County, which belongs to Yibin City, Sichuan Province, is located on the southern edge of Sichuan Basin, Gongxian County and Changning County to the east, Xuzhou District to the west, Yunlian County to the south, Cuiping District of Yibin City to the north, Nanxi District to the northeast and Yanjin County, Yunnan Province to the northeast and southwest, between longitude 104 °21 and latitude 28 °11 to 28 °47', the county is 61 km long from north to south and 32 km wide from east to west, with a total area of 1323 square kilometers. The mountains, hills and trough dams in Gaoxian County account for 43.88% respectively. 43.72%, 12.4%. There are 31 large and small rivers, belonging to the Jinsha River and the Yangtze River system, of which Nanguang River is the largest river in the county. It belongs to the humid monsoon climate in the middle subtropics, with an annual average temperature of 18.1 ℃ and a precipitation of 1021 mm.
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