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.
Hantai District, located in the center of Hanzhong Basin in Shaanxi Province, is the political, economic, cultural and information center of Hanzhong City. Hantai District is one of the largest commodity distribution centers and shopping centers in southern Shaanxi. The radiation surface can reach the surrounding counties and the adjacent areas of Shaanxi, Sichuan and Gansu. Hantai District is located in the south of Shaanxi Province, Qinling Beili and Bashan Nanlu. It is located in the center of the beautiful and rich Hanzhong Basin. The Hanjiang River originates from Ningqiang County in Hanzhong and flows through it from west to east. It has jurisdiction over 7 streets and 7 towns. Known as "the source of the Han family, the heart of abundance" and "Chinese Seoul, Tianhan resort, Sichuan-Shaanxi fortress, Qinba capital" reputation. Hantai District is also an advanced area of national cultural work, a national advanced city of health, a national advanced area of science and technology, a national advanced area of sports, and a national historical and cultural city. In December 2017, he was selected into the first batch of Shaanxi Province