The calculated distance (air line) between Darzāb and Fayrōz Kōh is approximately 101 miles respectively 163 kilometers.
By car or train, the actual journey to Fayrōz Kōh is certainly longer, as only the direct route (as the crow flies) between Darzāb and Fayrōz Kōh has been calculated here.
Air line (approximately)
163 kilometers
88 nautical miles