• Mesa
  • Lezhi

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.

Lezhi County, which belongs to Ziyang City, Sichuan Province, is located in the middle of Sichuan Basin, on the watershed of Tuojiang River and Fujiang River, between latitude 30 °032 "- 30 °304" north and longitude 104 °45.2 "- 105 °15.2" east. It is adjacent to Anju District of Suining City to the east, Anyue County and Yanjiang District to the south, Jianyang City of Chengdu to the west, Jintang County of Chengdu, Zhongjiang County of Deyang City and Daying County of Suining City to the north; it is only 77 kilometers away from the provincial capital Chengdu. Lezhi County has a total area of 1425 square kilometers and has jurisdiction over 17 towns and 8 townships. In 2015, the registered population was 837602 (permanent population 515200). In 2015, the county's regional gross domestic product (gdp) reached 17.81 billion yuan, an increase of 8.9 percent over 2014. The terrain tilts from northwest to southeast.
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