Q. What is a steep sided valley formed within the karstic regions by fluvial erosion or due to the collapse of the roof of a cave called?
Answer: Calanque
Notes: Karst topography is a result of the dissolution of soluble rocks like limestone, dolomite and gypsum. 
Calanque is a steep sided valley formed with the karstic regions due to fluvial erosion or due to the collapse of a roof of  cave.
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