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.
Suichang County, which belongs to Lishui City, Zhejiang Province, is located in the southwest of Zhejiang Province, the upper reaches of Qiantang River and Oujiang River, Wuyi and Songyang to the east, Longquan to the south, Jiangshan to the west and Pucheng in Fujian Province, and Qujiang, Longyou and Wucheng to the north. The county has a total area of 2510 square kilometers and a total population of 227400. It has jurisdiction over 2 streets, 7 towns, 11 townships, 203 administrative villages and 8 urban communities. Miaogao Street, where the county people's government is stationed. In July 2019, Suichang County was awarded the title of "China Natural oxygen Bar" in 2019. On October 2, 2019, it was selected as one of the top 100 green development counties and cities in 2019. The second batch of national agricultural products quality and safety counties.