A strait.
Isthmus
River or Canal
A narrow channel joining two larger bodies of water
it is a straight.
An isthmus.
That would be an isthmus.
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.
Straits are a narrow strip of water connecting two large bodies of water.
A strait is a narrow body of water that connects two larger bodies of water, such as connecting two seas or connecting a sea to an ocean. Examples include the Strait of Gibraltar, which connects the Atlantic Ocean to the Mediterranean Sea.
A Strait, is a narrow passage of water connecting two seas or two large areas of water.
A comparatively narrow passageway connecting two large bodies of water.