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.
Bange County, which belongs to Naqu City, Tibet Autonomous region, gets its name from the lake Bangucuo in the territory. It is located in the western part of northern Tibet, between Namucuo and Selincuo lakes on the northern Tibetan plateau. It is adjacent to Seni District in the east, Shenza County in the west, Dangxiong County in Lhasa City and Nanmulin County in Xigaze City in the south, and Shuanghu County and Ando County in the north. In 2014, Bangor County had a total area of 30138 square kilometers and a total population of 41579. The gross domestic product of the region reached 514.4658 million yuan. Tourist attractions are Ziri Gongba Temple, Chaodolangka Island, Namuco, Selincuo and so on. On February 6, 2019, the people's Government of the Tibet Autonomous region decided to withdraw Bange County from the poverty-stricken county.