• Mesa
  • Yunlong Xian

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.

Yunlong County, located in the longitudinal valley of the Lancang River in western Yunnan, is the joint of Dali Bai Autonomous Prefecture, Baoshan City and Nujiang Prefecture. It is connected to Eryuan and Mianyuan County in the east, Yongping County and Baoshan City in the south, Lushui City in the west and Jianchuan and Lanping County in the north. With a total area of 4400.95 square kilometers, the basic topography is high from east to west and low in the middle, gradually decreasing from north to south. It is a mountainous terrain, with Chongshan Mountains, Panshan Mountains and Qingshuilang Mountains arranged in the south-north direction from west to east, accounting for more than 90% of the total area of Yunlong County. On September 25, 2018, he won the honorary title of "2018 e-commerce into rural comprehensive demonstration county" of the Ministry of Commerce.
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