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.
Keqiao District, Shaoxing City, Zhejiang Province, is located in the east of Zhejiang Province and the northwest of Shaoxing City, with Huaiji Mountain in the south and Qiantang River in the north. It is adjacent to Shangyu District and Yuecheng District to the east, Shengzhou City and Zhuji City to the south, Xiaoshan District of Hangzhou City to the west, and Haining City of Jiaxing City to the north across the Qiantang River. The land area of the whole region is 1067.69 square kilometers. After the adjustment of administrative divisions in November 2019, the region has jurisdiction over 11 streets and 5 towns. At the end of 2018, the resident population was 986200 and the registered population was 681300. According to the preliminary calculation, the region's GDP reached 140.455 billion yuan in 2018, an increase of 6.8% at comparable prices. The per capita GDP was 207307 yuan, an increase of 5.2%. Realize wealth for the whole year