(a city), or Ar of Moab, one of the chief places of Moab (Numbers 21:28; Isaiah 15:1). In later times the place known as Areopolis and Rabbath-Moab. The site is still called Rabba. It lies about halfway between Kerak and the Wady Mojeb, 10 or 11 miles from each, the Roman road passing through it.
Smith's Bible Names Dictionary (1866)