The calculated distance (air line) between An Nāşirīyah and Mallawī is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Mallawī is certainly longer, as only the direct route (as the crow flies) between An Nāşirīyah and Mallawī has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles