• Mesa
  • Langxi 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.

Langxi County, which belongs to Xuancheng City, Anhui Province, was founded in the first year of Duangong in the Northern Song Dynasty (AD 988). Located in the southeast border of Anhui Province, at the junction of Anhui, Jiangsu and Zhejiang provinces, it is known as the "thoroughfare of the three provinces" and has a superior location. As of 2018, Langxi County has jurisdiction over 7 towns, 2 townships and 1 provincial development zone, with a total population of 347500 and an area of 1104.8 square kilometers. Langxi County has a mild climate, fertile soil and rich products, known as "land of fish and rice" and "natural botanical garden". It is an important producing area of grain, oil and silkworm cocoons in Anhui Province and a national commodity grain base county; the main specialties are green tea, yellow wine, golden jujube, stuffy sauce, wild goose, silverfish, green shrimp, crab, soft-shelled turtle, etc.; the main minerals are fluorite, yellow sand, limestone, granite, kaolin, pyrophyllite and so on.
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