• Mesa
  • Dunhua

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.

Dunhua City, which belongs to Yanbian Korean Autonomous Prefecture, is the "west gate" of Yanbian Prefecture. Located in the eastern mountainous area of Jilin Province, the hinterland of Changbai Mountain, one of the node cities in the pilot area of Changjitu development and opening up, it is the largest county-level city in Jilin Province and an important transportation hub in Jilin Province. it connects Jilin and Heilongjiang provinces, four districts and nine counties and cities. Dunhua is known as the "century-old county, the ancient capital of thousands of years". It is the capital of the Bohai Sea in the Tang Dynasty, Aodong City in the Ming and Qing dynasties, and the birthplace of the Manchu royal family. In 1881, a county was established and named Dunhua; in 1958, the county under the jurisdiction of the province was assigned to Yanbian Korean Autonomous Prefecture, and the county was withdrawn to set up a city in 1985. Dunhua is an excellent tourist city, a national sanitary city, a national garden city, a national model city with double support, a model collective of national unity and progress, and the name of Chinese solid wood products.
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