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.
Kunshan, a county-level city under the jurisdiction of Jiangsu Province, is hosted by Suzhou City. It has been more than 2200 years since Zilou County in the Qin Dynasty. Kunshan is the birthplace of Kunqu Opera, the ancestor of a hundred operas. Kunshan culture belongs to Wu-Yue culture, and the people of Kunshan belong to the people of Jiangsu and Zhejiang provinces. In September 2010, Kunshan, Vienna, Singapore and other five cities won the UN Habitat Award of the year. In January 2016, Kunshan was named the first batch of "National Ecological Garden cities" by the Ministry of Housing and Urban-Rural Development. In 2018, Kunshan achieved a GDP of 383.206 billion yuan. In 2019, Kunshan was named one of the top 100 counties and cities with comprehensive strength in 2019, one of the top 100 green development counties in 2019, and one of the top 100 new urbanization quality counties and cities in 2019. The second batch of national agricultural products