The calculated distance (air line) between Douane and Mennzel Bou Zelfa is approximately 19 miles respectively 30 kilometers.
By car or train, the actual journey to Mennzel Bou Zelfa is certainly longer, as only the direct route (as the crow flies) between Douane and Mennzel Bou Zelfa has been calculated here.
Air line (approximately)
30 kilometers
16 nautical miles