• Mesa
  • Yunyan Qu

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.

Yunyan District, which belongs to Guiyang City, Guizhou Province, is located in the north of the north-south "boat basin" of Guiyang City. It is located in the north half of Guiyang City, bordering Wudang District and Guanshan Lake District on the east, west and north, bordering Nanming District in the south and Baiyun District in the northwest. It is 17.5 km long from east to west, 12.5 km wide from north to south, and covers an area of 93.57 square kilometers. The total population is 950000 (2012). Yunyan District is one of the central urban areas of Guiyang City, the main part of the old city of Guiyang, and the resident area of the people's Government of Guizhou Province. In 2013, Yunyan District took the lead in breaking through 50 billion yuan in GDP, 30 billion yuan in fixed assets investment and 1 percent in total financial revenue.
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