Geological ridge
I think it could be either:
'geological ridge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arete that I've seen before include "Narrow mountain ridge - eater (anag)" , "Sharp ridge on mountain, with a tree" , "Glacial ridge" , "feature of range" , "part of mountain range" .)
'geological ridge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for esker that I've seen before include "gravelly deposit" , "Sediment" , "Gravel ridge; reeks (anag.)" , "bar, perhaps" , "Glacial ridge" .)