• Mesa
  • Zhouzhi

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.

Zhouzhi County, which belongs to Xi'an City, Shaanxi Province, is located in the west of Guanzhong, adjacent to the center line of Baima River in the east, Foping County and Ningshan County in the south, and Mei County and Taibai County in Baoji City in the west. Beipingwei River is adjacent to Wugong County, Xingping City, Yangling District and Fufeng County of Baoji City, between longitude 107o 39mm east and latitude 33 °42m 34 °14', with a total area of 2974 square kilometers and 68 kilometers away from Xi'an. Zhouzhi region is high in the southwest and low in the northeast, with a warm temperate continental monsoon climate. In the territory, there are the birthplace of Taoist culture, Lou Guantai, "the most blessed land in the world" and the birthplace of "Song of everlasting regret".
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