estuary
The Red river
The word is estuary. It means where the river flows into the sea.
The word source means, a place where something has its beginning or is found. eg: one from where a river flows.
The noun 'river' is not a proper noun.The noun 'river' is a common noun, a general word for a large natural stream of water that flows into another body of water, a word for a thing.
You probably mean the river bed.
It is a tributary.
Isis
A Tributary
Connecticut was given its name for one of the rivers that flows through it. The Connecticut River begins in New Hampshire and flows through three other states.
tributary
un fleuve - a river It's a little more specific than that. The French have two words for river: Riviere: a river that flows into another river. Fleuve: a (usually larger) river that flows directly into a salt water sea or ocean.
dam in a river