• Mesa
  • Lianyuan

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.

Lianyuan City, which belongs to Loudi City, Hunan Province, is located in the central part of Hunan Province, the northern margin of Hengshao Basin, the upper reaches of Lianshui and Sunshui. Lianyuan City, with a total area of 1830 square kilometers, has jurisdiction over 19 township offices and 1 high-tech zone, with a resident population of 983000 by the end of 2017. Lianyuan is located in the geometric center of Hunan and is an important transportation hub in central Hunan. Lou-Xin Expressway, Changshaolou Expressway, Erguang Expressway and Shanghai-Kunming High-speed Railway run through the whole territory. Lianyuan City is rich in natural resources, known as "sea of coal", "hometown of building materials" and "hometown of non-ferrous metals". It is Hunan energy and raw material base, 100 key coal-producing counties and cities, national well-known coal machinery production base, and national grain-producing counties. In 2018, Lianyuan City achieved a GDP of 29.06 billion yuan.
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