You might be referring to a "delta." The delta is where a river empties into a body of water, typically the ocean or sea. The delta gets its name from the shape created by the branches of the river that spread out in a triangular form where they meet the larger body of water, as the Greek symbol for delta is a triangle. River deltas are notoriously fertile areas as the river's current transports many minerals downstream and deposits them in the soil in the area of the delta, this mineral rich soil is referred to as "silt." The fertility of river deltas made them popular areas for settlement by early civilizations.
normally an estuary, but a wide spread estuary can be called a delta.
At the coast. This is the term for where land meets the sea.
Oceans, seas, reservoirs, lakes, bays
the ocean gets fullerer
Brine is a mixture of salt and fresh water, where a river joins the sea.
The Danube River flows into the Black Sea.
The River Volga flows into the Caspian Sea.
Tigris River Euphrates River Jordan River Mediterranean Sea Black Sea Red Sea Caspian Sea Persian Gulf Arabian Sea Gulf of Oman
The Caspian Sea
In Amble, Morpeth, Northumberland, UK, the River Coquet joins the sea.
it joins the river ouse
The canal joins the lower Volga River with the River Don linking the Sea of Azov and the Black Sea
ghaggar
Narmada
It ends at Ipswich when it joins the River Orwell, which flows into the North Sea.
Where a fresh water river joins and flows into the sea
Brazilians call amazon river :river sea
estuary
The River Nile flows into the Mediterranean Sea. And the Mediterranean Sea joins the Atlantic Ocean, not the Pacific Ocean.
Belfast is a port built at the mouth of the River Lagan and where it joins Belfast Lough, so it is close to the sea.
Brine is a mixture of salt and fresh water, where a river joins the sea.