• Mesa
  • ruoergai 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.

Ruoergai County, which belongs to Aba Tibetan and Qiang Autonomous Prefecture, is located on the northeast edge of the Qinghai-Tibet Plateau, located in the north of Sichuan Province, and is the north gate of Sichuan to the northwest province. the geographical coordinates are between 102 °08'E and 103 °39'E and 32 °56'N to 34 °19'N, bordering Maqu County, Luqu County, Zhuoni County, Diebu County and Neiaba County, Hongyuan County, Songpan County and Jiuzhaigou County of Aba Prefecture, respectively. The Yellow River and the Yangtze River divide it into east and west parts. The maximum distance between east and west and north and south is about 150 kilometers. It is 475.3 kilometers away from Lanzhou, 322.4 kilometers away from Markang, the capital of the state, 469.2 kilometers south from Chengdu, and 3406 meters above sea level. Ruoergai County covers an area of 10436.58 square kilometers. At the end of 2010, Ruoergai County
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