• Mesa
  • Lhari County

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.

Jiali County, located in the southeast of Naqu City, Tibet Autonomous region, is located between the Tanggula Mountains and the Nianqing Tanggula Mountains. It is located at 91 °09 east longitude and 32 °01 north latitude. East Lianchang City Bianba County and Linzhi City Bomi County, south of Lhasa City Dangxiong County, Lhasa City Linzhou County, Lhasa City Mozhu Gongka County, north Yibiru County. Jiali County has a total area of 13238 square kilometers and a total population of 31538 (2014). The area of cultivated land is 4613 mu and the area of woodland is 342000 mu. In 2000, the gross national product of the county was 131 million yuan. The rivers in the west of Jiali County belong to the upper reaches of the Lhasa River, while the eastern rivers belong to the upper reaches of the Yigong Zangbu River in a broad sense. The eastern part is special in climate: the warm and humid air flow in the Indian Ocean along Yigong
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