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.
Zhengxiangbai Banner is located in the southwest of Xilingol grassland in Inner Mongolia, a typical steppe area on the southern edge of Hunshandake Sandy Land. It is an important new green industrial base in the south of Ximeng League, an important trade and logistics node and distribution center in the south of Ximeng League, and an important ecological barrier in Beijing and Tianjin. Ming Antu town, where the people's government of the flag is located. Zhengxiangbai Banner is between 1200m and 1400m above sea level, with the highest elevation of 1776 m, with Hunshandake sandy land in the north and low mountain and hilly grasslands in the south. Due to the different landforms, the geographical environment is colorful. The flag is 112km long from north to south and 88km wide from east to west, with a total land area of 6229 square kilometers. It is adjacent to the developed area of Beijing, Tianjin and Hebei in the south, backed by the prairie, and connects the economic zone of eastern and western Mongolia from east to west. It is one of the areas closest to the economic circle around the Bohai Sea in Inner Mongolia Autonomous region. twenty