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.
Wuhe County, which belongs to Bengbu City, Anhui Province, is located in the north of Anhui Province, the middle and lower reaches of the Huaihe River, Sihong County, Jiangsu Province to the east, Mingguang City and Fengyang County, Chuzhou City, Anhui Province to the south, and Bengbu City and Guzhen County to the west. Sixian and Lingbi County are bounded by Sixian and Lingbi County, with a total area of 1580 square kilometers. Wuhe County gets its name because of the confluence of Huai, Fang, Qintong and Tuo rivers in the territory. It has a long history. It was called Guhong in the Tang Dynasty and Wuhe in the Song Dynasty. The most complete ancient rhombodon fossils of the Huaihe River have been unearthed in the country, dating from the late Pleistocene about 60,000 to 70,000 years ago. There are many Stone Age sites, including Bawang City, Huangdun Temple, Han Wangtai and Miss Yan's tomb. "picking Pomegranate" won Nanning International Folk Song Festival.