• Mesa
  • Sui Ning

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.

Suining, a prefecture-level city of Sichuan Province, also known as Doucheng and Suizhou, is located in the middle of Sichuan Basin. It is the regional central city of Chengdu-Chongqing Economic Zone, the modern industrial base of Sichuan Province, and the modern ecological garden city characterized by "heart-nourishing" culture. Chengdu is connected to the west, Chongqing, Guang'an and Nanchong to the east, Neijiang and Ziyang to the south, Deyang and Mianyang to the north, and an isometric triangle to Chengdu and Chongqing. Located in the main axis of the development of urbanization in Sichuan, it is one of the "six metropolitan areas" strategically deployed in Sichuan Province, and an important part of Chengdu economic circle and Chengdu plain urban agglomeration. Suining has a total area of 5300 square kilometers and has jurisdiction over 1 county-level city, 2 municipal districts and 2 counties. In 2018, the registered population is 3.6535 million and the city's GDP is 122.139 billion yuan. Located in the low hills of the central Sichuan Basin.
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