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.
Tianhe District, which belongs to Guangzhou City, Guangdong Province, is located in the east of Guangzhou City. It was established in 1985 by the suburbs of Guangzhou, connected with Huangpu District in the east, Haizhu District in the south across the Pearl River, Guangzhou Avenue in the west and Yuexiu District in the west, and adjacent to Baiyun District in the north. the total administrative area is about 137.38 square kilometers, with 21 streets under its jurisdiction. By the end of 2017, Tianhe District had a registered population of 902800 and a resident population of 1.6979 million. Tianhe District is the central area of the new city of Guangzhou, which is located on the new central axis of the city, connecting the west to the east, and then from north to south, which is the intersection of Guangzhou's east axis and south extension axis. Traffic resources are gathered in the area, with subway, bus rapid transit system (BRT), railway station and other multi-level urban transportation system. Guangzhou landmark CITIC Plaza, Guangzhou International Finance