What is the tidal mouth of a river, where fresh water and salt water mix, called?
Estuary
Where a river meets the sea, its mouth may form a delta or a funnel-shaped tidal opening depending on tides and sediment load.
An estuary is the tidal mouth of a river where fresh river water mixes with salty sea water, producing brackish water.
Strong tides keep washing away the sediments, so no delta forms; the Narmada and Tapi rivers of India form estuaries rather than deltas.
A lagoon, by contrast, is a shallow water body separated from the sea by a sand bar.
Hence, Estuary.
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