The calculated distance (air line) between Arīsh and Diyarb Najm is approximately 142 miles respectively 229 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Arīsh and Diyarb Najm has been calculated here.
Air line (approximately)
229 kilometers
123 nautical miles