Submerged Coastline
Coastal areas where relative sea level has risen, submerging terrestrial landscapes and creating distinctive drowned-valley coastlines.
Real World
The Milford Sound in New Zealand is a glacially carved fjord submerged by post-glacial sea level rise, reaching depths of 290 metres — far deeper than the surrounding Tasman Sea — illustrating how drowned glacial valleys create distinctive submerged coastline profiles.
Exam Focus
For 'compare' questions, explicitly contrast ria (fluvial) and fjord (glacial) origins rather than just describing one type.
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