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.
Qiongzhong Li and Miao Autonomous County is one of the ethnic autonomous counties under the jurisdiction of Hainan Province. the county is located in the middle of Hainan Island, the northern foot of Wuzhishan, tropical marine monsoon climate, long summer without heat, short winter without severe cold, with an average annual temperature of 22.8 degrees Celsius. It covers an area of 2704.66 square kilometers and has jurisdiction over 10 townships, 2 county forest farms and 1 county farm. In 2012, the county population was 228000, with Li accounting for 45.63% and Miao accounting for 6.1%. The middle line of Haiyu runs through the whole territory, and the highway network spreads out in the form of radiation. it is the transportation hub of Hainan Island highway in the north-south and east-west direction. Qiongzhong is the ecological core area of Hainan, with the laudatory name of "the Heart of Hainan, the Source of the three Rivers, the Forest Kingdom, the hometown of Green Orange, and the Home of Li Miao". It has national and provincial levels such as Wuzhishan, Limu Mountain, Diaoluo Mountain, Yinggeling and so on.