The calculated distance (air line) between Poponguine and Niakoul Rab is approximately 19 miles respectively 31 kilometers.
By car or train, the actual journey to Niakoul Rab is certainly longer, as only the direct route (as the crow flies) between Poponguine and Niakoul Rab has been calculated here.
Air line (approximately)
31 kilometers
16 nautical miles