# Siberia : the northeastern region of Russia in Asia; a vast geographical region with no precise boundaries, approximately 2.9 million square miles, it extends east across North Asia from the Urals (mountain range in the west Soviet Union) to the Pacific coast region known as the Soviet far east. ( figuratively) any undesirable or isolated locale, job, etc., to which one is assigned as punishment, a mark of disfavor, or the like.