• Mesa
  • Wushan Xian

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.

Wushan County, which belongs to Tianshui City, Gansu Province, is located in the southeast of Gansu Province. It is located in the compound zone between the western section of the northern slope of the Qinling Mountains and the southwest edge of the Longzhong Loess Plateau. It is between 1365 and 3120 meters above sea level, and belongs to temperate continental semi-humid monsoon climate. The total area is 2011 square kilometers and the total population is 460000 (2012). In 2012, Wushan County achieved a GDP of 3.88811 billion yuan. Wushan has water curtain cave, wooden ladder Temple, Laojunshan Forest Park, Caochuan prairie and other scenic spots. Wushan is a national standardized vegetable production demonstration county, a national green vegetable demonstration county, a national key vegetable production county, "the hometown of Chinese leek", "the hometown of Chinese folk culture and art", "the hometown of national martial arts" and "the hometown of jade articles". On April 28, 2019, the Gansu provincial government approved Wushan
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