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.
Yecheng County is the abbreviation of Yeerqiang, which is named after the Yeerqiang River. Yeerqiang is a Turkic language. According to the Records of Waterways in the Western region, it is interpreted as "vast land". It means "a city on a cliff". There is a local saying that "this place is hospitable". The Uyghur language is called Kagelak, the Tu Zhi of the Western region is Hargaric, and the Strategy of Xinjiang is Halharic. There are other names such as Halagarik, Haharic and so on. Interpretation of Tongwen Chronicles of the Western regions: "reply. The land is full of trees, and there are crows' nests, that is, all in name. " It is located in the southwest of Xinjiang Uygur Autonomous region, more than 1500 kilometers away from the capital Urumqi and 260km away from Kashgar. South by the Karakoram Mountains and Kunlun Mountains, north by the open plain, close to the Taklimakan Desert, the upper reaches of the Yeerqiang River, the topography is high in the south and low in the north. General noodles of Yecheng County