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.
Dinghu District, located in the west-central part of Guangdong Province and the lower reaches of the Xijiang River, is an important part of the central urban area of Zhaoqing City and one of the main bodies of the reform and development planning of the Pearl River Delta region. The land is located in the south of the Tropic of Cancer, between longitude 112 °57 east and latitude 23 °05 north; Sanshui District of Foshan City to the east, Sihui City to the north, Gaoyao District to the south and Duanzhou District of Zhaoqing City to the west. The terrain is high in the northwest, low in the southeast, Dinghushan Group of Beiling Mountains in the north, plain in the middle, Lanke Mountain extending to the east in the south, standing across the river with Dinghushan, the highest peak is Jilong Mountain, 1000.3 meters above sea level. The total area of the region is 596 square kilometers. Changchong Village in Yongan Town in the east, Shangshuitian Village in Fenghuang Town in the west, south in Dinghu District