The calculated distance (air line) between Kafr ad Dawwār and Sīdī Sālim is approximately 40 miles respectively 64 kilometers.
By car or train, the actual journey to Sīdī Sālim is certainly longer, as only the direct route (as the crow flies) between Kafr ad Dawwār and Sīdī Sālim has been calculated here.
Air line (approximately)
64 kilometers
35 nautical miles