A strait is a narrow channel of water that connects two large bodies of water. A gulf is a large bay that is an arm of an ocean or sea.
A narrow passage connecting two bodies of water is called a canal. These passages are manmade. The most famous one ever constructed is the Panama Canal. A natural feature with the same characteristics is called an isthmus.
Strait is narrow stretch of water joining 2 large bodies of water. Gulf is part of a large body of water that extends into a shoreline
A narrow stripe of land that connects 2 large bodies of water is an isthmus.
The answer is a strait.
it is a straight.
River or Canal