The calculated distance (air line) between L'Étang-Salé and Cilaos is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Cilaos is certainly longer, as only the direct route (as the crow flies) between L'Étang-Salé and Cilaos has been calculated here.
Air line (approximately)
16 kilometers
8 nautical miles