• Mesa
  • YUANYANG

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.

Yuanyang County is located in Xinxiang City, Henan Province, which is located in the northern plain of Henan Province, facing the Yellow River to the south and Yuhe Channel to the north, with high topography in the southwest and low in the northeast. The geomorphology belongs to the Yellow River alluvial plain. Its geographical coordinates are 113.36-114.15 degrees east longitude and 34.55-35.11 degrees north latitude. It is surrounded by Fengqiu in the east, Wuchuan and Huojia in the west, Xinxiang and Yanjin in the back, and facing Zhongmou and Zhengzhou suburbs in the south. It has a long history, splendid culture and Wuhua Tianbao. the greatness of a man lends glory to a place. The county has jurisdiction over 4 towns, 8 townships and 2 offices (its Central Plains Wu Town, Qiaobei Township, Zhulou Township and Longyuan subdistrict offices entrust Xinxiang Plain New District Management Committee to manage), with a total population of 620000 (2016) and a total area of 1022 square kilometers. Yuanyang, known as Bolangsha in ancient times, is famous for Zhang Liang's stabbing of Qin here. Since Qin
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