• Mesa
  • Seni District

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.

Seni District, which belongs to Naqu City, Tibet Autonomous region, is the political, economic, cultural, transportation, information and communication center of Naqu City. Seni District is bordered by Dangxiong County to the south, Nierong County and Ando County to the north, Biru County and Jiali County to the east, and Bangor County to the west. Xeni District is located in north-central Tibet, between Mount Tanggula and Nianqing Tanggula Mountains, both belong to the northern Tibetan plateau, with an average altitude of more than 4500 meters and a maximum elevation of 6500 meters. The maximum distance from east to west is 233km, and the maximum distance from north to south is 185km, with a total area of 16195 square kilometers. In 2016, the total population of Xeni District was 144116. In 2016, Seni District achieved a GDP of 2.267 billion yuan. In August 2011, Naqu County (Seni District) was awarded the hometown of Chinese specialty (yak).
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