Steep valley (6)
I believe the answer is:
ravine
(Other definitions for ravine that I've seen before include "Defile" , "Canyon" , "Steep-sided gorge" , "Vainer in narrow gorge" , "Type of gorge" .)
I believe the answer is:
ravine
(Other definitions for ravine that I've seen before include "Defile" , "Canyon" , "Steep-sided gorge" , "Vainer in narrow gorge" , "Type of gorge" .)