Upstream of the waterfall , the river is narrow ; downstream , it widens and meanders .
The bedload ( rocks that the river is carrying ) is mainly composed of large boulders , which are rolled along the river bed .
Upstream of the waterfall , the river is narrow ; downstream , river widens and meanders .
The bedload ( rocks that the river is carrying ) is mainly composed of large boulders , which are rolled along the river bed .