The calculated distance (air line) between Madīnat an Naşr and Diyarb Najm is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Madīnat an Naşr and Diyarb Najm has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles