• Mesa
  • Yunan Country

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.

Yunan County, which belongs to Yunfu City, Guangdong Province, is located in the west of Guangdong Province and the south bank of the middle reaches of the Xijiang River, across the river from Fengkai County and Deqing County of Zhaoqing City, between latitude 22 °48'- 23 °19 °north and longitude 111 °21'- 111 °54'E. the total area is 1966.2 square kilometers. Yunan County, located in the south of the Tropic of Cancer, belongs to the subtropical monsoon climate zone, with obvious solar terms and long frost-free period. As of 2018, Yunan County has jurisdiction over 15 towns, 177 administrative villages and 23 residential communities, with a permanent population of 416100. Yunan County Qin belongs to Guilin County, Han Li Cangwu County, Duanxi County in the early Jin Dynasty. In the first year of Jin Taikang (280 years), Duluo County was set up from Duanxi County; during the Song and Yuanjia years of the Southern and Northern dynasties, Duluo and Wucheng counties were abolished and Capital County was established; Mingwan
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