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.
Haining, a county-level city under the jurisdiction of Zhejiang Province, hosted by Jiaxing City, is located in the south wing of China's Yangtze River Delta, northern Zhejiang Province, Haiyan County in the east, Qiantang River in the south, across the river from Shangyu District in Shaoxing and Xiaoshan District in Hangzhou. Xiasha, Yuhang District and Jianggan District of Hangzhou, Tongxiang City and Xiuzhou District of Jiaxing in the north. It is 100 kilometers from Shanghai to the east, Hangzhou to the west and Qiantang River to the south. In 1986, the county was removed and the city was established. The name Haining was first seen in the second year of Yongding, Emperor Chen Wudi of the Southern Dynasty (558), implying the meaning of "serenity of the sea flood". Its scenic spot "Qianjiang surge" has been popular since the Tang and Song dynasties and is well-known at home and abroad. "on August 18, there is nothing spectacular in the world". It still attracts guests from all directions and sees the wonder of the tide. Haining City has a long history, a large number of celebrities from all walks of life, is Li Shanlan, Wang Guowei,.