• Mesa
  • Purang 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.

Pulan County (English: Purang County) belongs to the Ali region of Tibet, China. It is located in the southwest of Tibet Autonomous region, the south of Ali region, the south side of the Himalayas and the junction of China, India and Nepal. It is located between longitude 80 °27 "- 82 °30" east and latitude 30 °00 "- 31 °13" north. Pulan County has a total area of 12539 square kilometers. The total population is 10,000 (2014). County people's government in Pulan town Jirang community. Pulan County has jurisdiction over 1 town and 2 townships: Pulan Town, Baga Township and Hall Township. There are 10 administrative villages (communities). By the end of 2014, the county's GDP had reached 70.6 million yuan, with a growth rate of more than 18% for three consecutive years. The fiscal revenue was 2.4 million yuan, compared with 20%.
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