Submergent coastline are the opposite of emergent coastlines which have experienced a relative fall in sea-levels.
Features of a submergent coastline are:
Estuaries are often the drowned mouths of rivers.
The Western Coastal Plains of the Indian subcontinent are examples of submergent coastline. An ancient city of Dvārakā, mentioned in the great epic Mahabharata, is under water now. The coastline also forms the estuaries of the Narmada and Tapti rivers.
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