The calculated distance (air line) between An Nāşirīyah and Qaşr al Qarabūllī is approximately 50 miles respectively 80 kilometers.
By car or train, the actual journey to Qaşr al Qarabūllī is certainly longer, as only the direct route (as the crow flies) between An Nāşirīyah and Qaşr al Qarabūllī has been calculated here.
Air line (approximately)
80 kilometers
43 nautical miles