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.
Deqing County, named after "people have virtue, such as water to clear". It is under the jurisdiction of Huzhou City, Zhejiang Province, located in the west of Hangjiahu Plain in the Yangtze River Delta, and the county government is located in Wukang Street. The county has jurisdiction over 4 streets and 8 towns. The land area is 937.95 square kilometers, with an east-west span of 55.95km and a north-south span of 29.92km. The territory has scenic spots such as Mogan Mountain, Xiazhu Lake, Xinshi ancient town, French mountain residence Naked Heart Valley and so on. Deqing is known as "the scenic spot of famous mountains, the land of fish and rice, the house of silk, the land of bamboo and tea, and the land of culture". In 2018, Deqing County achieved a regional GDP of 51.7 billion yuan, an increase of 8%; total financial revenue of 10.08 billion yuan, an increase of 20.4%, of which local revenue was 5.91 billion yuan, an increase of 21.5%; urban and rural residents