Here's a breakdown of the term in a geographical context:
* River Mouth: The place where a river ends and empties into a larger body of water. This is often a point of significant change in water flow, salinity, and sediment deposition.
* Estuary: A type of river mouth where the river mixes with seawater, creating a unique ecosystem with brackish water (water that is saltier than freshwater but not as salty as seawater).
It's important to note that "mouth" can also have other geographical meanings depending on the context. For example:
* Mouth of a cave: The entrance to a cave.
* Mouth of a volcano: The opening at the top of a volcano where lava and gases erupt.
However, the most common geographical meaning of "mouth" is related to rivers and streams.