• Mesa
  • Diebu 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.

Diebu County, under the jurisdiction of Gannan Tibetan Autonomous Prefecture, Gansu Province, is located in the alpine canyon between Xiyanmin and Dieshan mountain systems in the Qinling Mountains, at the junction of Ganchuan on the eastern edge of the Qinghai-Tibet Plateau, Zhuoni in the north, Zhouqu in the east, Hadapu in Dangchang in the northeast, and Ruoergai County and Jiuzhaigou County in Sichuan in the southwest. It has a total area of 5108.3 square kilometers and has jurisdiction over 5 towns and 6 townships. In 2017, there were 54000 permanent residents, including Tibetan, Hui, Mongolian and other ethnic minorities. Diebu County was called "Diezhou" in ancient times, which means "thumb" in Tibetan and was called the place where the mountain gods "pressed" it. There are revolutionary sites such as the "Russian Boundary Conference" of the Red Army during the long March, the former residence of Chairman Mao in Zirina, and the Natural Insurance Battle of Lazikou. In addition, there are also Majiayao cultural sites and Tibetan Buddhist monasteries. September 25, 2018
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