the mainstream and delta of Han River
the mainstream of Tarim river
the mainstream smoke delivery
the Yangtze River mainstream
the Yellow River mainstream
A long the river cotton region
a regulated discharge regime of the river
actuality of the river course
capacity entering the river
cause of formation in the river pattern
channels across the river
constructing over the river
cubic capacity of materials falling into the river
cut off along the river
differentiation along the river
dig out sand to bring down the river be
ecosystem along the river
evaluation of the natural functioning of the river