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