The calculated distance (air line) between Damanhur and Sīdī Sālim is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Sīdī Sālim is certainly longer, as only the direct route (as the crow flies) between Damanhur and Sīdī Sālim has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles