The calculated distance (air line) between Giánnouli and Néa Smýrni is approximately 139 miles respectively 223 kilometers.
By car or train, the actual journey to Néa Smýrni is certainly longer, as only the direct route (as the crow flies) between Giánnouli and Néa Smýrni has been calculated here.
Air line (approximately)
223 kilometers
120 nautical miles