A rugged region, corresponds to the Heb. Argob (q.v.), the Greek
name of a region on the east of Jordan (Luke 3:1); one of the
five Roman provinces into which that district was divided. It
was in the tetrarchy of Philip, and is now called the Lejah.
Smith's Dictionary
(a rugged region), (Luke 3:1) is in all probability the Greek equivalent for the Aramaic Argob, one of the five Roman provinces into which the country northeast of the Jordan was divided in New Testament times. [Argob]