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.
Hebukesai Mongolia Autonomous County, which belongs to the Tacheng area under the jurisdiction of Yili Prefecture, Xinjiang, is located at the northwest edge of Junggar Basin, located in the center of Tacheng, Karamay and Altay, bordered by Altay and the Republic of Kazakhstan in the north, Manas County and Shawan County in the south, Karamay City in the southwest by Wuerhe, Baiyang River in the west and Baiyang River in Tuoli County in the west, and Altay in the east. The longest is 210km from east to west and 207km from north to south, with a total area of 30600 square kilometers (2013) and a total population of 54168 (2012). The Mongolian Autonomous County of Bukser gets its name from Hebuke River and Mount Sawur (Mount Sawur). "he Booker" is Mongolian, which means "sika deer"; "Sail" means horseback, mountain shape.