The calculated distance (air line) between Sīdī Sālim and Fuwwah is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Fuwwah is certainly longer, as only the direct route (as the crow flies) between Sīdī Sālim and Fuwwah has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles