The calculated distance (air line) between Marsassoum and Niakoul Rab is approximately 161 miles respectively 259 kilometers.
By car or train, the actual journey to Niakoul Rab is certainly longer, as only the direct route (as the crow flies) between Marsassoum and Niakoul Rab has been calculated here.
Air line (approximately)
259 kilometers
140 nautical miles