The calculated distance (air line) between Wādī as Sīr and Saḩāb is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Saḩāb is certainly longer, as only the direct route (as the crow flies) between Wādī as Sīr and Saḩāb has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles