The Daurs are floodplains in the region around the Himalayas, in the state of Assam in the north-east and in the north of West Bengal. ;
The altitude of daur typically varies from one area to the other but usually, the minimum is 90 m and the maximum is 1750 m.
In Nepal and North India, there is a specific place known as the Terai.
The daurs are floodplains, so the mechanism by which it is produced consists of the materials that are deposited on the edges of the rivers during a flood.
It is also known as silt, when the rivers overflow, these floods occur and leave certain particles behind that are classified as daurs.