Isthmus
River or Canal
A strait.
A strait is a narrow waterway that connects two larger bodies of water and typically separates two landmasses. It is often formed by natural forces such as erosion and can be important for navigation and trade between regions. Examples include the Strait of Gibraltar and the Strait of Hormuz.
A narrow channel joining two larger bodies of water
it is a straight.
An isthmus.
That would be an isthmus.
Straits are a narrow strip of water connecting two large bodies of water.
A Strait, is a narrow passage of water connecting two seas or two large areas of water.
A narrow passage of water connecting two seas or two large areas of water.
A comparatively narrow passageway connecting two large bodies of water.
what is an articial waterway