The calculated distance (air line) between Ar Rumaythīyah and Ar Riqqah is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Ar Riqqah is certainly longer, as only the direct route (as the crow flies) between Ar Rumaythīyah and Ar Riqqah has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles