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.
Songyang County belongs to Lishui City, Zhejiang Province, which is located in the southwest of Zhejiang Province. Liandu District, Lishui City in the east, Longquan City and Yunhe County in the south, Suichang County in the northwest, and Wuyi County in Jinhua City in the northeast. The most east to Yuxi Township Xindu, the most west to Fengping Township Longhu au, the widest from east to west is 53.7 km; the northernmost to Dachuan, Chishou Township, the southernmost to Dawan, Dadongba Town, the longest from north to south is 40.2 km. In 2018, the gross domestic product of Songyang County is 10.606 billion yuan. Songyang is a complete county model of "classical China", which is praised by Chinese National Geographic as "the last secret land in the south of the Yangtze River". In July 2019, he won the title of "China Natural oxygen Bar" in 2019.