The calculated distance (air line) between Montagne Blanche and Rivière du Rempart is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Rivière du Rempart is certainly longer, as only the direct route (as the crow flies) between Montagne Blanche and Rivière du Rempart has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles