The calculated distance (air line) between Gros Islet and Le Morne-Rouge is approximately 51 miles respectively 81 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 Gros Islet and Le Morne-Rouge has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles