Synonyms for Caucasus (same or very similar meaning)
WordNet sense 1 (the mountain range in Caucasia between the Black Sea and the Caspian Sea that forms part of the traditional border between Europe and Asia):
Caucasus MountainsWordNet sense 2 (a large region between the Black and Caspian seas that contains the Caucasus Mountains; oil is its major resource):
CaucasiaFrom the ODE community, based on WordNetadd/edit