• Mesa
  • Maqu 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.

Maqu County, which belongs to Gannan Tibetan Autonomous Prefecture of Gansu Province, is located in the southwest of Gannan Tibetan Autonomous Prefecture of Gansu Province, the eastern end of the Qinghai-Tibet Plateau, the junction of Gansu, Qinghai and Sichuan provinces, and the first curved part of the Yellow River. It is located between longitude 100 °4545 "~ 102 °2900" east and latitude 33 °0630" ~ 34 °3015 "north, bordering Luqu County of Benzhou by Xidianshan in the northeast and Ruoergai County and Aba County of Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province in the southeast. Maqu County has a total area of 10190 square kilometers and a total population of 54900 (2011), of which Tibetans account for 2/3, with an average elevation of 3700 meters. Maqu belongs to the Qiang nationality in ancient times. After Tubo unified the Qinghai-Tibet Plateau in 663 AD, it became a nomadic place for Tibetans. In 2011, Maqu
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