• Mesa
  • Tianmen

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.

Tianmen, known as Jingling in ancient times, is a municipality of Hubei Province, an important member of Wuhan City Circle and the urban agglomeration in the middle reaches of the Yangtze River, and the main node cities in the Han River Basin, located in the middle of Hubei Province and the north of Jianghan Plain, reaching Dahongshan in the north, Hanjiang River in the south and Wuhan in the east. In the fourth year of Emperor Yongzheng of the Qing Dynasty (1726), Tianmen Mountain was named "Tianmen". In 1994, the State Council approved Tianmen City to be directly under the jurisdiction of Hubei Province. In 2018, the city's resident population was 1.2723 million. Tianmen is an important birthplace of world tea culture, the hometown of Lu Yu, the largest hometown of overseas Chinese in the interior, and the hometown of steamed vegetables in China. It is a national sanitary city and a national garden city. It ranks among the top 100 county economies in the country and has been rated as one of the top 100 county economies for 12 consecutive years.
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