A river lies within a channel. There are different types of channles (3). #1. Broad, shallow channel, #2. Narrow, deep channel, and #3. Semicircular channel.
The river bed
it is called the tumber river
Channel
A river usually ends by flowing into an ocean, a lake or a bigger river. The place where the river flows out into a bigger body of water is called the "mouth" of the river.
What is the name for the end of a river
River mouth is the place where the river flows into a ocean or big body of water.
estuary
(Of A River) Place where a stream or river flows into a larger body of water.
lake
The Niger River flows through the Niger Delta into the Bight of Biafra in the Gulf of Guinea on the Atlantic Ocean.
(Of A River) Place where a stream or river flows into a larger body of water.
stream, creek or either a lake or a ocean