The calculated distance (air line) between Nasiriyah and Ash Shāmīyah is approximately 116 miles respectively 186 kilometers.
By car or train, the actual journey to Ash Shāmīyah is certainly longer, as only the direct route (as the crow flies) between Nasiriyah and Ash Shāmīyah has been calculated here.
Air line (approximately)
186 kilometers
101 nautical miles