Another word for mountain ridge is arête which is the French word for edge or ridge.
His glasses slid down the ridge of his nose. I'll walk the ridge line today.
The answer is ARETE
ridge
In Irish it's iomaire (furrow) / droim sléibhe (mountain ridge)
the thin mountain ridge is called an arête.
A ridge of fur on the cat stood straight up.
A mountain ridge.
Arete
Mountain Pine Ridge Forest Reserve was created in 1944.
My Blue Ridge Mountain Boy was created on 1969-09-29.
you can find it in the blue ridge moutains