The calculated distance (air line) between Sainte-Luce and Le Morne-Rouge is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Le Morne-Rouge is certainly longer, as only the direct route (as the crow flies) between Sainte-Luce and Le Morne-Rouge has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles