The calculated distance (air line) between Ross-Bétio and Niakoul Rab is approximately 128 miles respectively 205 kilometers.
By car or train, the actual journey to Niakoul Rab is certainly longer, as only the direct route (as the crow flies) between Ross-Bétio and Niakoul Rab has been calculated here.
Air line (approximately)
205 kilometers
111 nautical miles