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