The calculated distance (air line) between Sīdī Ghāzī and Al Maḩallah al Kubrá is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Al Maḩallah al Kubrá is certainly longer, as only the direct route (as the crow flies) between Sīdī Ghāzī and Al Maḩallah al Kubrá has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles