The Collaborative International Dictionary of English v.0.48:

Caucasia \Caucasia\ n. (Geog.)
   a large mountainous region between the Black and Caspian
   seas.

   Syn: Caucasus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Caucasia
    n 1: a large region between the Black and Caspian seas that
         contains the Caucasus Mountains; oil is its major resource
         [syn: Caucasia, Caucasus]