in Greek mythology, the name of a region in the far southeast corner of the Black Sea (in what is now Georgia), the homeland of Medea and associated with Jason and the quest for the Golden Fleece. Related: Colchian.

Others are reading

Definitions of Colchis from WordNet

Colchis (n.)
(Greek mythology) a region on the Black Sea to the south of the Caucasus that was the site of an ancient country where (according to Greek mythology) Jason sought the Golden Fleece;