• Mesa
  • Wutongqiao 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.

Wutongqiao District, which belongs to Leshan City, Sichuan Province, is located in the southwest of Sichuan Province, with geographical coordinates of 103 °39mm east longitude 103 °56pm and 29 °175mi 29 °31 'north latitude. It is bordered by Leshan and Chengdu in the north, Zigong, Neijiang and Shunmin River in the east, Yibin, Luzhou, Chongqing and the three Gorges of the Yangtze River in the east, Panzhihua and Xichang in the west, and 20 kilometers away from Leshan City. Wutongqiao District has a long history of industrial development. It is an important industrial base in Sichuan, a chemical base in Sichuan Province, and one of the top ten raw material bases of the Ministry of Light Industry. At the same time, Wutongqiao District is also the birthplace of farm music. After the major adjustment of administrative divisions in 2004, Wutongqiao District has a total area of 474 square kilometers and has jurisdiction over 11 towns and 1 township.
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