• Mesa
  • Qingshui Country

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.

Qingshui County, under the jurisdiction of Tianshui City, Gansu Province, is located in the southeast of Gansu Province, northeast of Tianshui City, Niutou River Basin, a tributary of the Weihe River on the north bank of Longshan, southwest of Longshan; Longxian County, Baoji in the east, wheat accumulation area in the south, Qinan County in the west, and Zhangjiachuan Hui Autonomous County in the north; it is located in the transitional zone from Longshan Mountain to Longxi Loess Plateau, with temperate continental monsoon climate; it has jurisdiction over 15 towns and 3 townships with a total area of 2012 square kilometers. The total population in 2018 is 332364. Qingshui was called Shangfu in ancient times and got the name of the county from "four Notes of Qingquan". It is the birthplace of Huangdi Xuanyuan, the first ancestor of Chinese humanities, the birthplace of Qin unified China, and the hometown of Zhao Chongguo in the Western Han Dynasty. Prehistoric culture, pre-Qin culture, Han and Tang culture, Song (Jin) and Yuan culture accumulation; the territory has been identified by the State Administration of Cultural relics as "Wei and Jin ancient city" and "not"
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