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.
Dongwuzhumuqin Banner (Dongwu Banner) is a flag belonging to Xilingol League in Inner Mongolia Autonomous region. it is located in the northeast of Xilingol League in Inner Mongolia Autonomous region, at the western foot of Daxinganling Mountains, and adjacent to Xingan and Tongliao City in the east. Xilinhot City in the south, Xiwu Banner in the west, Abaga Banner in the west, the border with Mongolia in the north, the national border is 527.6 kilometers long, and the international first-class land port-Zhuen Gadabu Port 68 kilometers north of the town of Ulyastai, Qifu, it is the bridgehead of the Eurasian Continental Bridge after Manzhouli and Erlianhot. In 2007, Dongwuzhumuqin Banner has jurisdiction over 5 towns, 4 sappan trees and 1 state-owned forest farm, with a total area of 47300 square kilometers.