The calculated distance (air line) between Najaf and Nahiyat Ghammas is approximately 25 miles respectively 41 kilometers.
By car or train, the actual journey to Nahiyat Ghammas is certainly longer, as only the direct route (as the crow flies) between Najaf and Nahiyat Ghammas has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles