Atlantic Ocean and Gulf of St. Lawrence
A strait
A Strait, such as the Bering Strait between Alaska and Russia or the Strait of Gibraltar between Europe and Africa.
Normally, that would be a Strait.
No that would be a tributary
strait
A narrow channel joining two larger bodies of water
A narrow body of water connecting two larger bodies of water is called a Strait.
A narrow body of water that connects two larger bodies of water (oceans?) is a strait. Examples are the Strait of Gibraltar, Malacca Strait, Yucatan Strait, Strait of Dover, and so on.
A comparatively narrow passageway connecting two large bodies of water.
what is an articial waterway
A strait is a narrow passage of water that connects two seas or other large bodies of water. A well known strait is Torres Strait, linking the Coral Sea and the Arafura Sea. Torres Strait lies between Australia and New Guinea.
The major straits in Asia include Bab el Mandab, Strait of Malacca, Bering Strait, Strait of Hormuz and Bosporus and the Dardanelles. A strait connect two large bodies of water together.