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.
Gaobeidian City is located in the middle of Hebei Province, southwest of Beijing, located in Beijing, Tianjin, Baoding triangle hinterland, around the capital Beijing-Tianjin economic circle, is an important industrial city in the south and north of Beijing. Gaobeidian City belongs to Baoding City. The total area of the city is 672 square kilometers. On April 9, 1993, Xincheng County was abolished and Gaobeidian City was established. The famous specialty products of Gaobeidian City include shredded tofu and famous figures such as Fan Yuqi. On January 25, 2019, he was selected as the national "Ping an Agricultural Machinery" demonstration county in 2018. In November 2019, he was selected into the list of the second batch of counties (districts) for the construction of a water-saving society.