• Mesa
  • Qingyang

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.

Qingyang City, Gansu Province is under the jurisdiction of prefecture-level cities, commonly known as "Longdong", is located in the easternmost part of Gansu Province, at the confluence of Shaanxi, Gansu and Ningxia provinces, Yanan City, Shaanxi Province in the east, Jingchuan County in Gansu Province and Changwu, Bin County and Xunyi County in Shaanxi Province in the south, Yulin City in Shaanxi Province and Wuzhong City in Ningxia to the north, and Guyuan City in Ningxia to the west. Qingyang City has a total area of 27119 square kilometers and a population of 2.2666 million (at the end of 2018). It has jurisdiction over one district and seven counties, and the municipal people's government is stationed in Xifeng District. In 2018, the GDP of Qingyang City reached 70.815 billion yuan. Qingyang City is one of the birthplaces of the early agricultural civilization of the Chinese nation, the hometown of "Huanjiang pterosaur" and "Yellow River ancient statue", the land of China's "first Paleolithic", and the birthplace of Chinese traditional medicine culture.
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