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.
Suihua, a prefecture-level city of Heilongjiang Province, means auspicious Anshun in Manchu. Suihua is located in the middle of Heilongjiang Province, in the Hulan River basin of Songnen Plain, Yichun, the capital of Lindu in the east, Harbin in the south, Daqing in the west, Heihe River in the north, and Hecheng Qiqihar in the northwest. Suihua City was established in 1885. It covers an area of 35000 square kilometers and covers an area of 35000 square kilometers. It has jurisdiction over three cities, six counties and one district. The landform features "two mountains, one water and seven fields". By the end of 2018, Suihua has a total population of 5.247 million. In 2018, the regional GDP of Suihua City reached 135.96 billion yuan, an increase of 4.1% over the same period last year; the public budget revenue totaled 6.1 billion yuan, an increase of 8.8% over the same period last year; the per capita disposable income of urban permanent residents was 25023 yuan; and that of rural residents