if you're talking about a stream like body its called a fjord.
a valley of water
The water body that separates Europe from Asia is the Ural River and the Ural Mountains.
An isthmus is a narrow body of water between two lands.
Mountains and bodies of water.
Canals; they have two lands and a narrow body of water in between!
The area between two mountains is known as a valley. Valleys are low-lying areas surrounded by higher landforms such as mountains or hills. They are often shaped by the flow of water or glaciers over time.
The Caucasus Mountains are located between the Black Sea and the Caspian Sea.
A valley. Depending on the formation it can also be a col /notch or saddle. Valleys will often be steep on both sides and or have a body of water passing through them.
The Caucasus Mountains
The Caucasus Mountains
Tigris river and the Euphrates river
A sound is a body of water between two pieces of land, and is wider than a strait. A sound is also wider than a channel.
A strait is a narrow channel of the sea joining two larger bodies of waterAn Isthmus is a relatively narrow strip of land (with water on both sides) connecting two larger land massesOne is a thin bit of water between two big bits of land (that is a strait) whereas the other is a thin bit of land between two big bits of water (that is an isthmus).