I doont know man
a flood!
The bottom of the river is called the river bed.
The river bed.
the bottom of the river is called a bed
bed
Normally there is a pool there, that is known as a plunge pool.
It is called a flat.
A dredge.
The bottom of a river is called the river bed.
Its name refers to the darkness of the river bed that has been lined with thick layers of decomposing vegetation.
dredging?
The sides are known as the river bank or river banks.