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.
Jingjiang City, referred to as "Jing" for short, is located in eastern China, the north bank of the lower reaches of the Yangtze River in Jiangsu Province, near the Jingjiang River, facing the river in the east, west and south, facing Jiangyin and Zhangjiagang in the south and southeast, adjacent to Rugao in the east and Taixing in the northwest. It is a new port industrial city in Jiangsu Province, with 54 kilometers of high-quality Yangtze River shoreline and convenient land and water transportation. The geographical location of Jingjiang is "strangling the gate of the river and sea and defending the whole Wu", so it is called "Jingjiang". "Jing" means stability and peace, and "Jiang" is because it is close to the Yangtze River, which means that Jingjiang is a city by the river. Jingjiang has been listed as an open area by the State Council and joined the Southern Jiangsu Torch Belt, which has become an important "bridgehead" for the Shanghai Pudong Development Zone and the Southern Jiangsu Torch Belt to radiate and extend to northern Jiangsu. Jingjiang is a first-class and powerful city north of the Yangtze River in Jiangsu Province, leading the counties and cities in northern Jiangsu. Jing