• Mesa
  • Yiyang

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.

Yiyang, alias "Silver City", "Lido" and "hometown of Badminton", is a prefecture-level city of Hunan Province, located on the south bank of Dongting Lake in the middle and lower reaches of the Yangtze River, located in the north of Hunan Province, at the eastern end of Xuefeng Mountain and its remaining vein belt. It is an important member of the urban agglomeration in the middle reaches of the Yangtze River, one of the core cities around Dongting Lake eco-economic circle, and one of the Changsha-Zhuzhou-Xiangtan 35th urban agglomeration. It has successively won provincial garden cities and national forest cities. National health city, national civilized city nominated city, historical and cultural city of Hunan Province and other titles, has been a rich "land of fish and rice" in the south of the Yangtze River since ancient times. Yiyang City has jurisdiction over 3 counties (Anhua County, Taojiang County,.
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