The calculated distance (air line) between Ḩakamā and Wādī as Sīr is approximately 44 miles respectively 71 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 Ḩakamā and Wādī as Sīr has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles