Submergent coastline

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A submergent landform: the drowned river valley (ria) of Georges River, Sydney

Submergent coastlines are stretches along the coast that have been inundated by the sea due to a relative rise in sea levels. This occurs due to either isostacy or eustacy.

Submergent coastline are the opposite of emergent coastlines which have experienced a relative fall in sea-levels.

Features of a submergent coastline are:

  • drowned river valleys or rias
  • drowned glaciated valleys or fjords.

Estuaries are often the drowned mouths of rivers.