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.
Yuexiu District, Guangzhou Municipal District, is located in the middle of Guangdong Province, bordering Tianhe District from Guangzhou Avenue in the east, facing the Pearl River in the south, facing Haizhu District across the river, Renmin Road in the west, adjacent to Liwan District, and Baiyun Mountain in the north. Adjacent to Baiyun District. Yuexiu District has 18 streets with a total registered population of 1.1584 million and a population density of 34735 people per square kilometer. In 2005, Yuexiu District became the central city with the smallest area and the highest population density in Guangzhou. Yuexiu District is the oldest central city of Guangzhou. Since the establishment of Nanhai County in Yuexiu District in the Qin Dynasty, Zhao Tuo, king of Nanyue in the Western Han Dynasty, built Nanyue Palace, and Liu Gongjian Guangying Palace in South Han Dynasty. Since the establishment of Guangzhou in Eastern Wu, the military and administrative centers set up in previous dynasties have been located in Yuexiu area. Yuexiu District brings together eight dynasties 2000