The calculated distance (air line) between Diourbel and Niakoul Rab is approximately 69 miles respectively 112 kilometers.
By car or train, the actual journey to Niakoul Rab is certainly longer, as only the direct route (as the crow flies) between Diourbel and Niakoul Rab has been calculated here.
Air line (approximately)
112 kilometers
60 nautical miles