• Mesa
  • Sichuan

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.

Sichuan, referred to as Sichuan or Shu, is one of the 23 provinces in China, the capital of Chengdu. It is located in the inland of southwest China, bounded by 26 °03 north latitude 34 °19 miles north latitude and 97 °21 miles east longitude 108 °12 'east longitude, connecting Chongqing to the east, Yunnan and Guizhou to the south, Tibet to the west, Shaanxi, Gansu and Qinghai to the north. The geomorphology of Sichuan Province varies greatly from east to west, and the topography is complex and diverse. it is located in the transitional zone between the first Qinghai-Tibet Plateau and the second plain of the middle and lower reaches of the Yangtze River, which is located in the Chinese mainland topography. The topography is high in the west and low in the east. It is composed of mountains, hills, plain basins and plateaus. Sichuan Province has three major climates, namely, the humid climate in the middle subtropics of Sichuan Basin, the subtropical semi-humid climate in the mountains of southwest Sichuan, the alpine plateau climate in northwest Sichuan, and the overall pleasant climate.
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