A chanel in which a stream flow or formerly flowed
Cataracts - water fall with volume of water.
The Ice Caps: It is the covering of Snow and Ice on the oceans of poles.
Offshore is the zone shallow bottom of the continental shelf.
Source of a river: place where river starts.
Water Divide: relief having two river systems.
Oasis: depression in the desert filled with rain water.
Desert: waste land unfit for human use at the moment.
Snow line: an imaginary line below which snow starts melting.
Delta: A triangular shaped fertile land built by river at the mouth.