• Mesa
  • Longchuan

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.

Longchuan, known as "Yuanyuan" in Dai language, means the place where the sun shines. Dehong Prefecture, Yunnan Province, is located in the southwest border of China, connected with Myanmar by mountains and rivers and buildings. The border is 50.899 kilometers long, with a land area of 1931 square kilometers and a total population of 181580 (2010). The county seat Zhangfeng is 779km away from Kunming, the provincial capital. It is the end of China's southwest border. Longchuan County has jurisdiction over eight townships and four towns and one state-owned farm, with a total area of 1913 square kilometers, with an area of 350000 mu of arable land, with a per capita cultivated land of nearly 3 mu. The county has a total population of 180000, including 120000 agricultural people. The main ethnic minorities in the territory are Jingpo, Dai, Achang, Lisu, Deang and Hui, which have the largest population distribution of Jingpo and Achang in China. Longchuan is a typical frontier multi-ethnic farmer.
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