valley
ria
A submergent coastal landform that forms where sea levels rise relative to the land either as a result of eustatic sea level change; where the global sea levels rise or isostatic sea level change; where the land sinks. When this happens valleys which were previously at sea level become submerged.
drowned river valley
drowned valley
https://en.wikipedia.org/wiki/Ria
valley
ENVO:00000418
ENVO