A ravine ridge's crest (5)

I believe the answer is:

chine

I believe this is a double definition.

'a ravine' is the first definition.
(Isle of Wight term for a ravine)

'ridge's crest' is the second definition.
(chine can mean a mountain ridge)

(Other definitions for chine that I've seen before include "Ravine" , "Backbone of animal" .)

I've seen this clue in The Independent.

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