Linden Avery and her companions travese an arête on their way to the Verge of Wandering.

a·rête /əˈreɪt/ [uhreyt]

–noun Physical Geography, Geology.
a sharp rugged mountain ridge, produced by glaciation. 

[Origin: 1860–65; < F; OF areste sharp ridge < L arista awn, ear of wheat]

Source: Dictionary.com.

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