• Mesa
  • Tongguan 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.

Tongguan District, which belongs to Tongling City, Anhui Province, is located in the southwest of Tongling City, named after Tongguanshan. East and southeast even the suburbs, west and Congyang County across the river, north Tongling County. The total area is 135 square kilometers. Tongguan District is the north gate of "two mountains and one lake", scenic spots-- Huangshan, Jiuhua Mountain and Taiping Lake, which gathers scientific and educational resources such as Tongling College, Tongling Vocational and Technical College, and Party School of the Municipal CPC Committee. It is the forward position and important carrier for Tongling to implement the strategy of "expanding from north to east". The cultural and natural landscapes include Tianjing Lake, Tongguanshan and Wumushan, which are national 4A tourist scenic spots. In 2018, Tongguan District has jurisdiction over 2 streets and 2 towns, and has another development zone with a resident population of 407000, achieving a GDP of 45.39469 billion yuan.
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