The calculated distance (air line) between Ar Raḩmānīyah and Damanhur is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Damanhur is certainly longer, as only the direct route (as the crow flies) between Ar Raḩmānīyah and Damanhur has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles