At the coast.
lakes
Usually other bodies of water - other rivers, seas, oceans, lakes etc.
delta
The Darling River does not enter the sea. It is a tributary of the Murray River, which has its mouth at the southern coast, near Encounter Bay.
Another body of water, such as, a lake, the sea or another river.
Salts are dissolved from the earth and transported in seas/oceans by rivers.
A river Delta.
I'm no scientist so I don't no. But there's at least a billion rivers and probably 80% don't directly lead to the ocean
The British Isles are not by a river, but by a number of seas and one ocean,the atlantic. The most famous river in the islands would be the Thames.
because when the rivers enter into the sea the area and amount of water is large and they distributed into many delts
Usually down hills or slopes down to the sea or a lake.
headland are usually capes /deltas are where rivers meet the sea