The calculated distance (air line) between Nāḩiyat al Fuhūd and Najaf is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Najaf is certainly longer, as only the direct route (as the crow flies) between Nāḩiyat al Fuhūd and Najaf has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles