rivermouth
nounUK /ˈrɪvəmaʊθ/
US /ˈrɪvərmaʊθ/
The place where a river ends and flows into a bigger body of water.
Boats often gather near the rivermouth to head out to sea.
OTHER MEANINGS
2. The wide part of a river where it meets the sea and fresh water mixes with salt water.
The rivermouth is home to many kinds of fish and birds.
3. A place where a smaller stream empties into a larger river.
We camped by the rivermouth where the creek joins the main river.
4. The opening or passage at the end of a river channel.
Sand built up at the rivermouth over the summer.