The tidal area.
A 'floodplain'.
The flood plain
how the river gets purified in pakistan
A part of a river that has little or no flow (current) [usually a side-branch that gets inflows only periodically].
A map!
how the river gets purified in Pakistan
yes
The Yellow River gets its color and name from the yellow loess found in the water. This river is located in China.
From the olombia River
Antarctica is not known for its rivers, because as you assume in your question, the continent is covered -- 98% of it -- with an ice sheet. Any 'river' in Antarctica is truly seasonal, glacial melt water that flows in the 24/7 summer sun. As it gets colder, the water freezes again, the glaciers freeze again, and there is no more 'river.'
The water gets colder.
rain