The calculated distance (air line) between Al Faḩāḩīl and Az Zawr is approximately 26 miles respectively 42 kilometers.
By car or train, the actual journey to Az Zawr is certainly longer, as only the direct route (as the crow flies) between Al Faḩāḩīl and Az Zawr has been calculated here.
Air line (approximately)
42 kilometers
23 nautical miles