Tropidophorus assamensis
Habitat
On or near dry stream beds
Range
North-east India (Mizoram, Assam) and Bangladesh; possibly Bhutan
The north-eastern water skink is found only in north-east India (Mizoram, Assam) and Bangladesh, and might occur in Bhutan. Individuals have been collected on or near dry stream beds (Wikipedia, general species account).
The account used here gives no further detail.