The calculated distance (air line) between Ar Raḩmānīyah and Damietta is approximately 72 miles respectively 117 kilometers.
By car or train, the actual journey to Damietta is certainly longer, as only the direct route (as the crow flies) between Ar Raḩmānīyah and Damietta has been calculated here.
Air line (approximately)
117 kilometers
63 nautical miles