The calculated distance (air line) between Al Jammālīyah and Diyarb Najm is approximately 39 miles respectively 62 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 Jammālīyah and Diyarb Najm has been calculated here.
Air line (approximately)
62 kilometers
34 nautical miles