Ar (a city), or Ar of Moab, one of the chief places of Moab. Num. 21:28; Isa. 15:1. In later times the place was 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.