• Mesa
  • Baoshan District

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.

Baoshan District, located in the north of Shanghai, is divided into two parts: land and island. On land, it is bordered by the Yangtze River in the northeast, Huangpu River in the east, Yangpu, Hongkou, Jing'an and Putuo in the south, Jiading District in the west, Taicang City in Jiangsu Province in the northwest, and Yunzaobang in the middle of China. Wusong Bridge, Yunchuan Road Bridge, Jiangyang Road Bridge and Tangqiao Bridge span it. The two islands of Changxing and Hengsha lie in the south branch of the Yangtze River Estuary from west to east. They are 56.15km long from east to west and 23.08km wide from north to south, covering an area of 424.56 square kilometers. Located at the confluence of the Huangpu River and the Yangtze River, Baoshan can be called the "waterway gateway" of Shanghai. It connects more than 400 ports in 164 countries and regions by sea. The throughput of containers accounts for more than 70% of Shanghai Port.
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