The calculated distance (air line) between Le Morne-Rouge and Gros Islet is approximately 51 miles respectively 81 kilometers.
By car or train, the actual journey to Gros Islet is certainly longer, as only the direct route (as the crow flies) between Le Morne-Rouge and Gros Islet has been calculated here.
Air line (approximately)
81 kilometers
44 nautical miles