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.
Lang County, which belongs to Linzhi City, Tibet Autonomous region, is located in Lang County, southwest of Linzhi City, with an area of about 4106 square kilometers and the border between China and India is 100km long. It has jurisdiction over 3 townships, 3 towns, 52 administrative villages and 1 neighborhood committee (Lamba neighborhood committee). In 2011, the resident population of the county was 15037, and the ethnic groups in the county were mainly Tibetans. in addition, there were Han, Mamba, Mongolian and other ethnic groups, of which Tibetans accounted for 99%. The county seat is 420 kilometers away from Lhasa and 240 kilometers away from Bayi District, where the Linzhi Municipal Government is located. Famous and special products are mainly a variety of animal products, chili, Fritillaria, Wulingzhi, grapes, apples, walnuts and Tibetan hats, wooden bowls and so on. Mount Zarisaba in the territory is a sacred mountain of Buddhism. The hometown of the 13th Dalai Lama Tudeng Gyatso and the ninth Panchen Lama Qujinima is in Lang County.