The calculated distance (air line) between Mariel and Arroyo Naranjo is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Arroyo Naranjo is certainly longer, as only the direct route (as the crow flies) between Mariel and Arroyo Naranjo has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles