The calculated distance (air line) between Al Manzalah and Diyarb Najm is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Al Manzalah and Diyarb Najm has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles