• Mesa
  • SiXian

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.

Sixian, which belongs to Suzhou City, Anhui Province, is located in the northeast of Anhui Province, bordering Sihong in the east, Lingbi in the west, Wuhe and Guzhen in the south, and Suining and Suqian in the north-east. The total area is 1787 square kilometers. Sixian County has a long history and was established as early as the Xia Dynasty. It is one of the important birthplaces of Sizhou opera, a national intangible cultural heritage. There are natural and beautiful "Hongxiang eight scenery", the ancient battlefield of the Chu-Han struggle-Bawang City monuments and sites, Sui and Tang dynasties Grand Canal Tongji Canal sites and other historical sites. As of 2018, Sixian County has jurisdiction over 12 towns, 3 townships, and another development zone. The resident population is 851000, with a regional gross domestic product (GDP) of 20.894 billion yuan. In terms of sub-industries, the added value of the primary industry is 5.005 billion yuan, and the secondary industry is increasing.
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