• Mesa
  • Yi'an 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.

Yi'an District, which belongs to Tongling City, Anhui Province, is located in the central and southern part of Anhui Province, on the south bank of the middle and lower reaches of the Yangtze River, close to the developed Yangtze River Delta, between longitude 117 °42 "- 118 °10" 6 "east longitude and latitude 30 °45 12"-31 °07 56 "north. Fanchang and Nanling to the east, Qingyang and Guichi to the south, and Zongyang and Wuwei to the northwest. It is only 152 kilometers away from the provincial capital Hefei. In 2017, Yi'an District has jurisdiction over 6 towns and 2 townships, with a total area of 845 square kilometers. In 2016, there were 290932 registered residents (255000 permanent residents). In 2016, the gross domestic product (GDP) of Yi'an District reached 13.593 billion yuan. Yi'an, who first appeared in the first year of Tang Wende (AD 888), is the development of Chinese bronze civilization.
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