source

where the river comes from.

headwaters

The source of a stream.

downriver

toward or situated at a point nearer the mouth of a river.

tributary

a river or stream flowing into a larger river or lake.

confluence

the junction of two rivers, especially rivers of approximately.

floodplain

an area of low-lying ground adjacent to a river.

delta

a piece of land shaped like a triangle that is formed when a river splits into smaller rivers before it flows into an ocean

Comment Stream