A river mouth is the part of a river where the river flows into another river, a lake, a reservoir, a sea, or an ocean.
1 Water motion 2 Landforms 3 Cultural influence 4 See also 5 References
The water from a river can enter the receiving body in a variety of
different ways. The motion of the river mainly depends on the
relative density of the river compared to the receiving water and any
ambient motion in the receiving water, such as tides or
If the river water is denser than the surface of the receiving water,
the river water will plunge below the surface at the plunge curve. The
river water will then either form an underflow or an interflow within
the lake.
If the river water is lighter than the receiving water, as is
typically the case when fresh river water flows into the sea, the
river water will float along the surface of the receiving water as an
Alongside these advective transports, inflowing water will also
At the mouth of a river, the change in flow condition can cause the
river to drop any sediment it is carrying. This sediment deposition
can generate a variety of landforms, such as deltas, sand bars, spits,
and tie channels.
Many places in England take their names from their positions at the
mouths of rivers, such as Plymouth (
^ Charles, Hogg, (2014-06-12). "The flow of rivers into lakes: Experiments and models". doi:10.17863/cam.32. ^ Rowland, J. C.; Dietrich, W. E.; Day, G.; Parker, G. (2009). "Formation and maintenance of single‐thread tie channels entering floodplain lakes: Observations from three diverse river systems". Journal of Geophysical Research. 114 (F2). doi:10.1029/2008JF001073.