if you're talking about a stream like body its called a fjord.
The only body of water that makes any separation between the two is the Black Sea and the Bosporus.
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.
The Caucasus Mountains
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
valley is the landform that located two mountains