DUARS: They are the foothills of the eastern himalayas in north east India..TERAI: They are marshy land at foot of mountain of the Himalayas in North India….CHOS: The Network of river in north of the plains jointed with the shiwaliks are called chos…
The duars are the alluvial foodplains in the eastern-northeastern India that lie south of the eastern foothills of Himalayas and north of Brahmaputra river basin.
The alluvial soil consists of various proportions of sand, silt and clay. As we move inlands towards the river valleys, soil particles appear some what bigger in size. In the upper reaches of the river valley i.e. near the place of the break of slope, the soils are coarse. Such soils are more common in piedmont plains such as Duars, Chos and Terai.Duars are the floodplains and foothills of the eastern Himalayas in North-East India around Bhutan.Terai is a belt of marshy land at the foot of mountains at the foot of the Himalayas in North India.\xa0

large numbers of seasonal hill torrents which leave the Siwalik Range and enter the level plain. These torrents are swollen with water soon after heavy showers in the neighbouring hills and carry with them a heavy load of coarse sand and silt. They are furious when rushing to the plains. They are called ‘chos’ in the plain where their beds are broad, braided, shallow and sandy. They are quite numerous and in some places every kilometre has a ‘chos’.