The calculated distance (air line) between Damanhur and Diyarb Najm is approximately 61 miles respectively 98 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Damanhur and Diyarb Najm has been calculated here.
Air line (approximately)
98 kilometers
53 nautical miles