The calculated distance (air line) between Santo Domingo and Arroyo Naranjo is approximately 139 miles respectively 224 kilometers.
By car or train, the actual journey to Arroyo Naranjo is certainly longer, as only the direct route (as the crow flies) between Santo Domingo and Arroyo Naranjo has been calculated here.
Air line (approximately)
224 kilometers
121 nautical miles