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.
Panshi City, which belongs to Jilin City, Jilin Province, is located in the south-central part of Jilin Province and the south of Jilin City. Located at 42 north latitude. 39 years old 43. 27', longitude 125 east. 39 years old 126. Between 41'. It borders Huadian City in the east, Huinan County in the south, Meihekou City, Dongfeng County and Yitong County in the west, Yongji County in the northeast, and Shuangyang District in Changchun City in the northwest. The city covers an area of 3867.3 square kilometers and has jurisdiction over 13 towns, 1 township, 3 streets and 2 provincial economic development zones. Panshi City has a total population of 520978 (2016), including 16 ethnic groups such as Han and Korean; in 2015, the city's regional GDP reached 25.6 billion yuan. In October 2018, Panshi was selected as one of the top 100 counties and cities with investment potential in 2018.