- Mountains, range between the Black and Caspian Seas (8)

I believe the answer is:

caucasus

(Other definitions for caucasus that I've seen before include "Region of SE Europe" , "part of Europe" , "Mountainous area between Caspian and Black seas" , "Black and Caspian sea region" , "Black-to-Caspian Sea range" .)

I've seen this clue in The Mirror.

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