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.
Hailing District is under the jurisdiction of Taizhou City, Jiangsu Province. The northern part of the hailing area belongs to the Lixia River plain area and the southern part belongs to the Yangtze River Delta plain area; it belongs to the northern subtropical humid monsoon climate zone with four distinct seasons, long frost-free period, abundant heat and abundant precipitation; the administrative area of Hailing District covers an area of 374.7 square kilometers and has a population of 586800 people. It has jurisdiction over 10 streets and 4 towns. Hailing District is located in the middle of Jiangsu Province and the north bank of the middle and lower reaches of the Yangtze River, facing Yangzhou to the west and Nantong to the east, facing Suzhou, Wuxi and Changzhou across the river. Hailing was once called "Siling" with Guangling Yangzhou, Lanling Changzhou and Jinling Nanjing. Hailing east and west undertake the two major economic circles of Shanghai and Nanjing respectively. The Beijing-Shanghai Expressway, National Highway 328, Ningqi Railway and five waterways connecting the Yangtze River to the sea in central Jiangsu meet here. In November 2018, he was selected as one of the top 100 industries in 2018.