Answer:
The upper course of the river is in the mountains. The river flows swiftly and its valley floor is narrow although the valley has steep sides. In its lower course, the valley is very broad it is called a floodplain because the river may overflow over it after heavy rain. The river has large meanders and near its mouth, the river may form deltas. In its middle course the river valley is wider. The valley bottom is gently sloping.