The calculated distance (air line) between Tanta and Diyarb Najm is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Diyarb Najm is certainly longer, as only the direct route (as the crow flies) between Tanta and Diyarb Najm has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles