bacause they have smaller bodies than us and fish need sea salt to breath
a river mouth
The Yenisei (also spelled Yenisey) River flows into Yenisey Gulf, a part of the Kara Sea, from Siberia. The Kara Sea is part of the Arctic Ocean.
The river delta.
the red sea
It flows in to the Moray Firth, which is part of the North Sea.
The Yenisei (also spelled Yenisey) River flows into Yenisey Gulf, a part of the Kara Sea, from Siberia. The Kara Sea is part of the Arctic Ocean.
that part of the mouth or lower course of a river in which the river's current meets the sea's tide.
A river - the "river-mouth" is where it empties into the sea or a lake.
The mouth is the part of a river of stream where it meats a sea or ocean.
The Nile empties into the Mediterranean Sea.
estuary
The largest river in Egypt is Nile; check the spelling for the last part of the phrase !